AIRMAR DST810 Smart Multisensor User Guide

AIRMAR DST810 Smart Multisensor

Specifications

• App Name: CAST™ Mobile App
• Compatibility: iOS and Android devices
• Sensor Compatibility: Airmar Smart™ Multisensors with Bluetooth Security
• Security Protocols: PSTI and other proprietary protocols
• Data Output: NMEA 0183 sentences, CAN-NMEA 2000 PGNs
• Communication: Encrypted Bluetooth

Usage Instructions

• Download the App: Download the complimentary Airmar CAST application from either the App Store (iOS) or Google Play (Android).
• Power On Sensor & Enable Bluetooth: Confirm that your Airmar sensor is powered on and that Bluetooth is enabled on your mobile device.
• Search for Devices: The app will display a screen for searching devices Searching for Devices with Wireless signal icon).
• Select Your Sensor: Choose your sensor from the list. The app will display the ‘Connecting’ screen and automatically turn on your device’s camera.
• Scan QR Code: Scan the QR Code on the label using your device’s camera Scanning QR Code). The QR Code can be found on the Quick Start Guide cover page and on the Bluetooth label attached to the sensor cable.
• Show Pincode and Connect: After scanning, tap ‘SHOW PINCODE AND CONNECT TO THE DEVICE’ on your smart device. A six-digit PIN will be generated.
• Record PIN code: Record this six-digit code for future steps.
• Bluetooth Pairing Request: Upon identifying the correct sensor, a Bluetooth Pairing Request prompt will display Bluetooth Pairing Request).
• Enter PIN code: Enter the six-digit code you recorded earlier.
• Pair: Tap ‘Pair’ to complete the connection. A secure connection with the sensor is now established.
• Customize Device: The ‘Customize Device’ screen opens (Figure 5: Customize Device).
• Enter Friendly Name: Enter a ‘Friendly Name’ to identify your sensor (e.g., MyDST820). This name will be displayed when reconnecting to the device in future CAST™ sessions.
• Select Vessel Type: Select your vessel type by tapping either ‘SAIL BOAT’ or ‘MOTOR BOAT’.
• Save Settings: Tap the check mark to save your settings. The ‘Device Data’ screen will appear, showing Depth, Trim, and Heel – this is the CAST default (Home) screen Device Data).Note: Scanning the PSTI QR code is necessary during the initial connection. If a new device is used, the Airmar CAST app is reinstalled, or the ‘Remove Device’ command is selected, the code must be rescanned. For future device access, it is required to retain the Quick Start Guide with QR code. Important: Do not remove the labels attached to the cable.
• Level the Vessel: Ensure your vessel is level.
• Go to Offsets Page: Navigate to the ‘Offsets’ page within the app.
• Check Pitch and Roll: Check the Pitch and Roll values. If they are not within 0.1 of 0.0, expand the page and press ‘Hold to Calibrate’ Calibrating Pitch and Roll Offsets). CAST averages readings over approximately 10 seconds.
• Verify Calibration: After calibration, both Pitch and Roll should read 0.0 (±0.1).
• Recalibrate if Necessary: If either measurement differs by more than 0.1, perform the calibration process again.

Troubleshooting

• Error Messages During Connection: Error messages may appear if:
  • The matching sensor isn’t selected.
  • The sensor is off.
    • There is a wireless connection issue.
• To address the issue, follow the ‘Initial Connection’ steps again.
• Unsuccessful Connection Attempts: If multiple connection attempts are unsuccessful, please reach out to Airmar Technical Support by submitting a ticket at: https://www.airmar.com/Product-Support.
• Bluetooth Signal Strength: Bluetooth signal strength may be diminished by large objects such as fuel tanks or other obstructions. Ensure a clear line of sight or proximity to the sensor.
• QR Code Requirement: The PSTI QR code is essential for initial connection, and also if the app is reinstalled, a new device is used, or the ‘Remove Device’ command is selected. Always retain the Quick Start Guide with the QR code and do not remove labels attached to the cable.
• Pitch and Roll Calibration Issues: If Pitch and Roll values are not within 0.1 of 0.0 after calibration, repeat the calibration process.

Copyright © 2026 Airmar Technology Corp. All rights reserved.
All Rights Reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded, or stored in any storage medium, for any purpose without prior written consent of Airmar®. Airmar hereby grants permission to download a single copy of this manual and of any revision of this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or any revision hereto, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited. Information in this manual is subject to change without notice. Airmar reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes. Visit the Airmar website at www.airmar.com for current updates and supplemental information concerning the use and operation of this and other Airmar products. Images may vary based on operating system, model and CAST™ version and release date.

WARNING

• Navigation Aid Only – The Airmar® CAST app is intended only as a navigational aid and must never be considered as a replacement for caution, sound judgement, and proper navigational skill.
• It is used to configure and display navigational data from individual sensors.
• The user is responsible for the accuracy of the data used to calibrate the connected sensor. Only official government charts and NTMs contain all necessary information for safe navigation. As always, the captain is responsible for their prudent use and safety of passengers and crew.

INTRODUCTION

• CAST™ is a mobile app for iOS and Android that connects wirelessly to multiple Airmar® SmartTM Multi-sensors using PSTI and other security protocols.
• It protects data and privacy, allowing users to monitor sensor data, configure outputs, calibrate settings, and adjust performance from their devices.

Key features of CAST:

• Customizable real-time graphical and numerical sensor data displays.
• Simple setup for NMEA 0183 sentences and CAN-NMEA 2000® PGNs.
• Choice of output protocols, data rates, and sensor settings.
• Remote firmware updates and custom user profiles.
• Encrypted communication for user and vessel data protection.

INITIAL CONNECTION TO YOUR AIRMAR SENSOR

1. Download the complimentary Airmar CAST application from either the App Store® or Google Play®.
2. Confirm that your Airmar sensor is powered on and that Bluetooth® is enabled on your mobile device.
   Note: Bluetooth® signal strength may be diminished by large objects—such as fuel tanks or bulkheads—positioned between the sensor and your smart device. For optimal performance, position your device near or directly above the sensor with a clear line of sight.
3. Upon launching CAST, your device may prompt you to grant access to features such as the camera, nearby devices, location, and wireless services; these permissions ensure full application functionality.
4. On the Searching for Devices screen, the application displays all available in-range sensors, each identified by its broadcast name (for example, DST820).
5. If more than one sensor is visible in the list, you may need to turn your sensor off and then on again. When the sensor is powered off, a wireless signal icon will flash next to its name, which can help identify the device. Once the flashing stops after the sensor is powered on, it is ready for pairing.
6. Choose your sensor from the list. The app displays the Connecting screen and automatically turns on the device’s camera.
7. Scan the QR Code on the label using your device’s camera. You can find the QR Code on the Quick Start Guide cover page and on the Bluetooth® label attached to the sensor cable.
8. After scanning, tap SHOW PINCODE AND CONNECT TO THE DEVICE on your smart device. A six-digit PIN will be generated.
9. Record the six-digit code for future steps.
10. Error messages may appear if:
    • The matching sensor isn’t selected
    • The sensor is off
    • There is a wireless connection issue
11. To address the issue, follow the Initial Connection steps again.
    Note: If multiple connection attempts are unsuccessful, please reach out to Airmar Technical Support by submitting a ticket at: https://www.airmar.com/Product-Support.
12. Upon identifying the correct sensor, a Bluetooth Pairing Request prompt displays.
13. Enter the six-digit code recorded earlier.
14. Tap Pair to complete the connection. A secure connection with the sensor is now established.
15. The Customize Device screen opens.
16. Enter a Friendly Name to identify your sensor (i.e., MyDST820). This name is displayed when reconnecting to the device in future CAST™ sessions.
17. Select your vessel type by tapping either SAIL BOAT or MOTOR BOAT.
18. Tap the check mark ✔ to save your settings. The Device Data screen appears, showing Depth, Trim, and Heel — this is the CAST default (Home) screen.
    Note: Scanning the PSTI QR code is necessary during the initial connection. If a new device is used, the Airmar® CAST app is reinstalled, or the Remove Device command is selected, the code must be rescanned. For future device access, it is required to retain the Quick Start Guide with QR code.
    Important: Do not remove the labels attached to the cable.
19. Level the vessel and go to the Offsets page.
20. Check Pitch and Roll values; if not within ±0.1° of 0.0°, expand the page and press Hold to Calibrate. CAST averages readings over about 10 seconds.
21. After calibration, both Pitch and Roll should read 0.0° (±0.1°).
22. If either measurement differs by more than ±0.1°, perform the calibration process again.
    Note: The Roll values display with a “P” for Port or “S” for Starboard. See the OFFSETS PAGE for
    more detailed information.

CAST™ MODE OPTIONS

The CAST app offers two modes: BASIC MODE and ADVANCED MODE. By default, CAST opens in Basic mode.
To switch to Advanced mode:

1. Tap the Mobile Menu (☰) icon to open the CAST main menu.
2. Under User Mode, select Advanced.
3. When prompted, confirm your selection by tapping OK.
4. To return to Basic mode, repeat the steps above and select Basic instead.

BASIC MODE

• Basic Mode provides a simplified interface with key sensor data organized into dedicated pages. Also see ADVANCED MODE.

DEVICE DATA

1. Once your device is connected, the CAST™ app automatically shows available data from your sensor—Depth (from the transducer), Speed (through water), Attitude (Trim and Heel), and Water Temperature. Tap anywhere on the screen to switch between the graph and text view.
2. A “–” in a field indicates the function is disabled or unavailable. For example, if Depth is not displaying a value, ensure the sensor’s urethane face is contacting the water. If the water body floor exceeds the sensor’s maximum range, no depth data displays.
3. The speedometer starts with a default range of 0–15 knots (this adjusts based on your selected units). As speed increases, the display scales automatically to keep readings clear and easy to read.

Note: The CAST app shows “Depth Below Surface” if a positive depth offset is saved to the sensor, and “Depth Below Keel” if the offset is negative. See OFFSETS PAGE for setup details.

CUSTOM PAGES
CAST™ allows you to create Custom Pages to personalize your data views beyond the default screen. To create a Custom Page:

1. Tap the Add Page ( + ) button in the top-left corner of the Device Data screen. The Choose Page Layout page displays.
2. Choose a Page Layout that matches your preferred display format. Options include:
   • One large (top), two small (bottom)
   • Two small (top), one large (bottom)
   • Two large
   • Three small
   • Four small
   • Five small
   • One large
3. A blank page layout displays.
4. Tap Add Data ( + ) to assign a data type to each section of the layout. The Choose Data Type screen displays.
5. Tap a data type to update the display. Available data types include:
   • Speed
   • Depth
   • Attitude
   • Water Speed
   • Distance Total
   • Distance Trip
6. Select any of the available Data Types and the data displays.
7. Press and hold the page label, such as ” to rename the page, for example “Speed.”
8. Press and hold the trash can button to delete the page. Deletion is immediate without confirmation.

CUSTOMIZE THE DISPLAY
To customize the display on this or any other data pages:

1. Press and hold the data element you wish to modify, for example Temperature.
2. The Choose Data Type screen displays, shown earlier.
3. Choose the new data to display; the view updates accordingly.

NMEA 2000® PGN OUTPUTS IN CAST™
The Airmar® CAST app supports multiple NMEA 2000® PGNs, which govern sensor data formats in marine networks. The NMEA 2000® page lists all PGNs available from the connected device.

1. Tap the NMEA 2000 page heading. The supported NMEA 2000 PGNs display.
2. Supported PGNs are:
   Proprietary PGNs (Off by default):
   • Depth Quality – PGN 65408
   • Speed Pulse Counts – PGN 65409 (paddlewheel units only)
   • Internal Temp. & Voltage – PGN 65410
     Standard PGNs (enabled by default unless otherwise stated):
   • Heartbeat – PGN 126993 (cannot be disabled)
   • Attitude – PGN 127257
   • Speed (Speed Water Reference) – PGN 128259
   • Water Depth (with Transducer Offset) – PGN 128267
   • Distance Log – PGN 128275
   • Barometer, Temperature – PGN 130310 (disabled by default)
   • Barometer, Temperature, Humidity – PGN 130311
   • Temperature – PGNs 130312 and 130316
3. Except for Heartbeat, each PGN can be Enabled or Disabled. When disabled, Off appears; when enabled, the output Interval displays.
4. Output rates indicate the number of PGNs sent per unit time. For example, an Attitude (127257) PGN showing “1.00 s” means it is output once per second, while “2.00 s” indicates output once every two seconds.
   Note: When the Interval increases, the Frequency (Hz) decreases accordingly.
5. Tap the Down arrow next to an item to display options.
6. Tap the value in the Interval field. The keypad displays.
7. Enter the new Interval and tap the checkmark. The new interval is set.
8. Tap the switch to enable (Green) or disable (Red) the PGN output.
9. Tap the Up arrow to collapse the available options.

Note: Changing the PGN output or output rate will not change the internal data calculation rate.
Important: Disabling a PGN using the switch prevents data from being sent to the network, but it will not prevent the sensor from calculating a value internally. For example, disabling the Depth (128267) PGN prevents depth information from being provided to the network, but it will not stop the sensor from pinging for depth.

UNITS
Units for Speed, Depth, Temperature, and Distance* can be selected individually. For example, speed can be displayed in miles per hour while distance is displayed in nautical miles.
Note: *Height and Pressure are not available for the DST820 and TriSonic SmartTM Series.

1. Adjust the display units by tapping the Settings button at the top right corner of any CAST screen. The Settings options display.
2. Tap the current Units value, such as kn for Speed, and the available Units display in a pop-up.
3. Tap a different Units value to select; the new unit is selected.
4. Adjust other Units values as required.
5. Tap outside the Settings dialog to close it.

OFFSETS

Users can adjust any underlined value in the Airmar® CAST™ app using Offsets. Tap a value to open the keypad and modify or delete its Offset.
When entering table values, use the following guidelines:

• Tap a cell to adjust its value with the keypad.
• Enter the number, then tap the “+/-” button to make it negative.

CAST allows users to program the following sensor offsets to match vessel-specific installation parameters:

• Temperature: Adjustable ±9.9 °C
• Depth: Adjustable ±10.0 m
• Pitch and Roll: Adjustable ±45°

The Hold to Calibrate function enables automatic zeroing of Pitch and Roll according to the vessel’s current orientation. Utilizing these settings ensures precise data output from the Airmar sensor, particularly when accounting for mounting location and vessel geometry. See INITIAL CONNECTION TO YOUR AIRMAR SENSOR

INFORMATION PAGE

The Information page displays sensor details and management commands. Sensor Information includes the following :

• Device Name – A combination of the sensor Model Number and Friendly Name.
• Friendly Name – The sensor name – established during Initial Connection.
• Serial Number – The Airmar serial number – unique to the connected device.
• Part Number – The Airmar part number for the connected device.
• Firmware Version – The current firmware version. Take note of all firmware versions for any technical inquiries.

INFORMATION PAGE COMMANDS

• REMOVE DEVICE… – Tap REMOVE DEVICE to disconnect the sensor from the current tablet or phone. This option can be used when connecting to a different Airmar sensor or before using the Forget Device function in your device’s Bluetooth® settings.
• CUSTOMIZE – Tap CUSTOMIZE to change the Friendly Name or to change the vessel type (Sail Boat or Motor Boat).
• Diagnostic Tools – Tap the down arrow button to open Diagnostic Tools. In this section, you can view and filter system messages in order of severity, respectively: (NOTICE, WARNING, ALERT, or FATAL).
• Tap Share to choose your device’s Share Actions for sharing Diagnostic reports. Share actions are based on your individual device options, such as EMAIL, COPY, SAVE.

Tip: Using Diagnostic Tools helps identify error conditions and streamlines troubleshooting, keeping your system operating effectively—especially useful for technical support inquiries.

ADVANCED MODE

• Advanced Mode includes all functionalities of Basic Mode, along with additional pages for enhanced configuration and diagnostics: SENSORS and ADVANCED.

SENSORS

• You can enable or disable each sensor on this page. Sensors are enabled by default. When Enabled, the Sensors pings for data at a default or custom Sensing Interval —for example, 500 milliseconds—to match navigational requirements.

Note: All sensor Interval values range from 0 to 1,000 milliseconds for the following values:

• Pitch/Roll
• Temperature
• Voltage
• Depth
• Speed

ADVANCED PAGE

• The Advanced page provides greater control over sensor behavior and system operations. Options include Depth, Speed Filter, and Demo Mode. Commands include UPGRADE FIRMWARE, RESET TRIP WATER DISTANCE and RESET TO DEFAULT.

DEPTH SETTINGS

Averaging: Depth averaging refers to how CAST™ processes rapid or minor fluctuations in raw depth readings. Instead of displaying every instantaneous change (which may vary wildly due to wave action, boat motion, or turbulence), the system calculates a running average—producing a steadier, easier-to-read value. Depth Averaging, or Smoothing, options include:

• Off – No averaging. This gives you the most real-time view of constantly changing depth values. Best used in smooth conditions or for applications where maximum responsiveness is needed.
• Low – Applies light smoothing. Depth readings remain fairly responsive but are filtered to reduce minor spikes or drops.
• High – Applies heavier smoothing. Best for choppy water, rough sea conditions, or vessels experiencing frequent motion. Provides a more stable reading by filtering out small, rapid fluctuations.

Bulb Keel Depth: Accounts for vessels with large fin or bulb keels, such as sailboats. These keels sometimes interfere with the depth sensor’s ability to track the bottom depending on where it is mounted. The effect is a consistent keel echo reflection, which can be mistaken for a bottom echo if the real bottom is lost for some reason (cycling power, exceeding the operational range of the sensor, etc.) The sensor has logic that places higher detection and tracking requirements on shallow echoes to mitigate this, allowing data to represent the lowest point of the hull.

• Off – The vessel has no bulb keel; Depth Offsets should be entered in the Offsets page. The Depth Offset is the distance between the sensor position and the lowest position of the hull (typically a negative number).
• Specified depth, in feet – Select a Bulb Keel Depth between 7.5 and 20 feet. Select the depth setting that is greater than the depth of the keel and any diagonal distance from the sensor. Bulb keel entries must calculate this diagonal distance. See BULB KEEL EXAMPLE for more information.

The 6 defined values for the field are:

• 0 – Option is off.
• 7 – Apply the higher requirements to 7.5 feet
• 10 – Apply the higher requirements to 10 feet.
• 13 – Apply the higher requirements to 13 feet.
• 15 – Apply the higher requirements to 15 feet.
• 20 – Apply the higher requirements to 20 feet.

BULB KEEL EXAMPLE

• The sensor is horizontally 9’ from the center of the bulb keel (A). The bottom of the keel is 8’ lower than the sensor position (B). Following the Pythagorean Theorem:
  • 92 + 82 = 81 + 64 = 145
• The square root of 145 is 12.04, meaning that the bottom of the keel is ~12’ from the sensor (C). Therefore, select a Bulb Keel depth at the next higher setting of 13’. Your individual vessel settings will vary based on sensor location.

• Bulb Keel Rejection Threshold: Sets a limit for ignoring abnormal depth readings based on keel displacement. Select a value between 1 and 7, with 1 being the least sensitive.
• Power Reduction Level: Adjusts sensor power usage for efficiency or performance. Select a value between 1 and 8 with 1 being the lowest power reduction level.

SPEED FILTER

Choose from the following options to apply filtering that stabilizes water speed readings in dynamic conditions:

• Off – No filtering. The speed value updates in real time with all fluctuations.
• Low – Light smoothing. Speeds remain responsive with minimal delay.
• Medium – Moderate smoothing. Useful for general navigation with occasional water turbulence.
• High – Maximum smoothing. Best for reducing noise in very choppy or high-interference conditions.

DUAL HULL OPTION
The Dual Hull Option, available only for UDST models, allows vessels with dual hull configurations, such as catamarans, to use two transducers for instances when one hull is not immersed in water. Functionally, the UDST820 must be installed on the STARBOARD side and the UDST822 must be installed on PORT side. During Initial Connection, both units must be scanned and connected to CAST separately to enable the dual switching mode. The devices must be on the same NMEA2000 bus to work correctly.
Important! Both sensors MUST HAVE Pitch and Roll calibrated to use the DUAL HULL OPTION!

1. Tap the switch to enable (GREEN) or disable (RED) Dual Hull Mode.
2. When enabled, CAST gathers data from both units at 0 degrees up to when the Cruise Angle is reached.
3. The Cruise Angle default of 6 degrees represents +3 to STARBOARD and -3 degrees to PORT. For example, if you roll +3 degrees (STARBOARD), both sensors will report the STARBOARD side sensor data in CAST. When you roll -3 degrees (PORT), both sensors will display the PORT side data in CAST.
4. Special considerations must be made when performing Speed Calibrations in DUAL HULL instances. Refer to ADVANCED SPEED CALIBRATION – DUAL HULL MODE for additional information.

DEMO MODE
This mode simulates live sensor data for training, troubleshooting, or display purposes.

1. Tap the switch to enable (Green) or disable (Red) Demo Mode.
2. In Demo Mode, CAST is designed to simulate real nautical conditions, displaying sample data for Speed Through Water, Attitude, Depth, and Water Temperature.
3. Disable Demo Mode to return to displaying live vessel data.

UPGRADE FIRMWARE
Connect to the Airmar server to check for and install firmware updates. Follow these steps to upgrade:

1. Tap UPGRADE FIRMWARE.
2. Tap YES to confirm. The process may take up to 20 minutes.
3. Keep the mobile device close to the sensor.
4. If the update is interrupted, CAST prompts you to restart from the beginning or resume from the last completed step.
5. A message box appears if the current version is up to date; no firmware updates are necessary.

RESET TRIP WATER DISTANCE

• Select to clear all existing trip distance data. A warning message displays confirming the reset.

RESET TO DEFAULT

• Select to reset the device to Default Settings. A confirmation dialog displays. All device configurations will be deleted, and the device requires power cycling. Tap Yes to proceed.

OFFSETS PAGE

• Offsets are available for Depth, Temperature, Heel, and Trim, allowing adjustment of displayed data according to a vessel’s configuration.
• An offset is an additive value that adjusts the raw data reported by the sensor. A positive offset increases the measured value, while a negative offset decreases it. The unmodified sensor reading is labeled Raw. To apply or update an offset, tap the underlined value in the app.
• Depth Offset: If your keel/hull extends 1 foot below the transducer face, enter -1 as the Depth offset. One foot will then be subtracted from every depth reading, allowing the displayed depth to reflect the distance below the keel/hull.
• Temperature: Temperature offsets follow the same logic as Depth Offsets: the entered value is added to (or subtracted from) the sensor’s raw temperature reading.
• Heel and Trim Offsets: Heel and Trim can also be adjusted using Offsets – measured in degrees. These allow you to manually or automatically zero the attitude readings when your vessel is at rest.

AUTO ATTITUDE CALIBRATION

Note: This procedure is done at initial connection. Repeat if Heel and Trim values are inconsistent.

1. Ensure the vessel is stationary and level.
2. Tap and hold the Hold to Calibrate button.
3. Over approximately 10 seconds, CAST calculates the average raw heel and trim values—progress is shown by an orange bar.
4. When the bar flashes green, the average values are applied automatically, and the sensors should then display close to 0.0° for both Heel and Trim.
   Important: The calculation uses a time-based average, so any vessel motion during the calibration period may affect the results.
   To calibrate manually: You may also enter offset values directly. For example, if the raw heel is 7.8°, entering an offset of -7.8 will result in a net heel of 0.0°, effectively re-zeroing the display.

SPEED CALIBRATION

• The Airmar CAST app offers fast, accurate speed calibration, accounting for currents and hull flow changes—such as those caused by heeling. The app supports multiple calibration methods to fine-tune performance.
• Heel-Corrected speed calibration requires Attitude calibration. When initially selected, Speed Calibration displays a notification screen. Enabling Attitude PGN and completing Attitude Calibration are necessary to proceed.

• Basic speed compensation uses a percentage to scale measured speeds, unlike fixed-value offsets. For instance, a 10% compensation changes 10 kn to 11 kn and 20 kn to 22 kn.
• Sensor readings are affected by water flow, hull shape, surface roughness, and strake placement. Always follow the transducer’s installation guide for accurate positioning and calibrate the sensor in real-world conditions.
• To calibrate, timing over a known distance is common, but water currents can distort results. Calibrating with raw GPS SOG may also be inaccurate if currents are present, as they affect GPS readings.

BASIC SPEED CORRECTION
The simplest way to calibrate speed is a single-point percentage offset. This type of calibration applies a fixed percentage correction to every reading from the sensor.

1. Navigate to the Speed Calibration tab. By default, the speed calibration is set to “OFF.”
2. Tap BASIC.
3. If the desired percentage adjustment is known, you can simply enter it into the Compensation field.
4. See BASIC SPEED CORRECTION to have CAST™ calculate the correct percentage adjustments.

BASIC SPEED CALIBRATION

HEEL-CORRECTED SPEED CALIBRATION
Note: Make sure the Attitude PGN is enabled on the NMEA 2000® page. Once enabled, make sure the sensor has been calibrated with the boat stationary. Refer to the Offsets Page for Attitude sensor calibration. Heel-corrected Speed Calibration and the Advanced Speed Calibration Table cannot be used without Attitude enabled and calibrated.
Boat heel angle affects speed readings from the sensor. The sensor can store calibrations for up to two angles per side, in addition to the standard setting, which requires using the Advanced table.
As heel changes, the sensor interpolates between calibration curves. For instance, with 15% compensation at 10° and 5% at 0°, a 10% adjustment is applied at 5 degrees. Heel-corrected calibrations follow the standard process but cannot use opposite-direction runs, so calibrate in slack water.
CAST can calculate the percentage using one of two methods.

• SOG: Speed through water is calculated using a GPS reference speed over ground. See SOG METHOD.
• Distance: Speed through water is calculated using travel time over a known distance such as a measured mile. See DISTANCE METHOD.

SOG METHOD
The SOG method allows the app to calculate your average speed over ground using the internal GPS in your smart device. You can also manually enter an average value from an external source.

1. Bring the boat up to calibration speed. This is the speed where you want the greatest accuracy in your speed reading and is different for each boat.
2. Once traveling at a constant speed and direction, tap the Primary button. The app will count down as it calculates an average indicated speed from the device and an average GPS SOG.
3. Once complete, the average for each value is shown and the Primary button changes to Reverse.
4. Turn the boat 180° and bring it back to the same speed used in the primary direction. You don’t need to hold exactly the same speed from the primary run, but the closer, the better. Maintain a consistent speed and direction.
5. Tap Reverse and wait for the app to count down while the average speeds are calculated. The second run in the opposite direction allows the app to calculate (and adjust for) the speed of the current and remove it from the calculation.
6. Once complete, the app displays the calculated percentage adjustment. Tap Apply to save the value.
7. The speed correction value has now been calculated and saved to memory in the device. It is applied to all speed values sent to the network and transmitted wirelessly to the app. All devices connected to the NMEA 2000® network display the adjusted value.
8. The value can be manually adjusted by tapping the value on the Speed Calibration screen.

DISTANCE METHOD
The Distance method calibrates speed without GPS by timing how long it takes to travel a known distance at a steady speed. The app compares the calculated average speed with the sensor’s indicated speed.
Note: Calibrating with a known distance necessitates both precise measurement between two reference points and accurate travel time recording. Shorter distances increase the likelihood of measurement error; therefore, a minimum recommended distance for speed calibration is one statute mile.

1. Select the Distance button.
2. Enter the known distance between two points in the units indicated.
3. Bring the boat up to calibration speed. This is the speed where you want the greatest accuracy in your speed reading and is different for each boat.
4. When you pass the starting point, tap Start. The app begins counting in seconds.
5. When you pass the end point, tap Stop. The number of runs will increase by one and the calculated speed is shown.
6. The number of runs already completed is shown as Completed Runs. Total Time is a count of the total number of seconds for all runs. Run Speed shows the average recorded device speed on the last run, while Speed shows the overall average. Run Correction is the correction factor calculated on the previous run, and Correction is the overall average correction factor calculated.
7. Follow the same process for additional runs. If you would like to discard a run, tap Discard Run once complete and try again.
   Note: If calibrating where a strong current exists, complete an even number of runs—half in one direction and half in the opposite (about 180° apart)—to ensure the average properly reflects the current.
8. Once complete, tap Apply to save the value.
9. The speed correction value has been calculated and stored in the sensor’s memory. This adjustment is automatically applied to all speed data transmitted to the network and wirelessly to the app. All devices integrated with the NMEA 2000® network will display the corrected values.
10. The value can be manually adjusted by tapping the value on the Speed Calibration screen.

ADVANCED SPEED CALIBRATION
Note: The advanced speed calibration table will override any other programmed speed corrections. It will not be added on top of the existing speed calibration. Before switching to the Advanced calibration table, make sure to carefully quantify the performance of the sensor without any corrections in place.
The Advanced Speed Calibration Table allows fine adjustment of speed correction over multiple speeds and angles.

• Up to two angles per side can be selected.
• Up to 10 non-zero speeds can be added to the table.

Note: For Advanced Speed Calibration, set the table’s highest value to match the vessel’s top speed. If actual speed exceeds this, the sensor uses a linear correction based on the last value, which may quickly reduce accuracy if that value is too low. Make sure your table covers all expected speeds, regardless of how many points it contains.

1. To use the Advanced speed calibration table, first switch speed calibration to Off.
2. Either manually or using 3rd party software, collect the difference between indicated speed and actual speed through water at each calibration point.
3. The table is organized with speeds in columns and heel angles in rows. Each cell is the speed correction (in units of speed, such as knots, mph, etc.) applied to that specific heel angle and speed combination.
4. The default Speed Calibration page contains two speed columns: 4.0 and 8.0, and one Port and one Starboard Heel angle of 5. Enable the Advanced Speed Calibration Table on the Speed Calibration tab to view the Speed Calibration table.
5. Expand the table to the desired number of rows and columns. Input the differences measured previously. For example, if at 0° of heel and 8 kn indicated speed the actual speed through water was measured at 8.5 kn, enter 0.5 in that cell. If the actual speed through water was measured at 7.5 kn, enter -0.5 in that cell.
6. Make sure to fill out the table completely. Remove any unused rows and columns by selecting the heading and tapping the X.
7. To enter a Speed value, tap a row or column heading to edit its value. Tap X to delete the row or column; a confirmation message appears. Tap +/- to toggle between negative/positive.
8. The Advanced table does not adjust the basic speed calibrations; it is a standalone method of speed calibration that overrides the others. Inaccurate STW values will occur if the table is not completely filled in.
9. Make sure to save a record of the table as entered. Because the Advanced speed settings override all others, the table is deleted if you return to Basic Speed Calibration settings, or if you turn off Speed Calibration. The table speeds will need to be re-entered.

Important! On some devices, the Speed Calibration commands – OFF, BASIC, and ADVANCED – do not display when the device is in Landscape mode. Turn back to Portrait mode to display the commands.
Note: Make sure to keep a record of the data in the Advanced table. As long as the table is active, the data is saved to memory in the sensor. If the Advanced Speed table is disabled by switching back to Basic or Off, on confirmation, the data in the table is permanently deleted.

ADVANCED SPEED CALIBRATION – DUAL HULL MODE

The Speed Calibration method is the same for each transducer; however, each transducer must be calibrated separately, and the Dual Hull Mode must be set to OFF for both transducers. Follow these instructions when performing Advanced Speed Calibration in Dual Hull configurations:

1. Connect to the Port Side Transducer in CAST.
2. Select the Advanced tab.
3. In the Dual Hull Option pane, turn OFF the Dual Hull Option (RED).
4. Connect to the Starboard Side Transducer in CAST and turn OFF the Dual Hull Option (RED).
5. Perform the ADVANCED SPEED CALIBRATION for the Starboard transducer.
6. Connect to the Port Side Transducer in CAST.
7. Perform the ADVANCED SPEED CALIBRATION for the Port transducer.
8. Select the Advanced tab and turn ON the Dual Hull Option (GREEN).
9. Connect to the Starboard Side Transducer in CAST and turn ON the Dual Hull Option (GREEN).

CONTACT

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