Garmin Descent™ S1 Owner's Manual

Introduction

Consult the Important Safety and Product Information guide in the product box for more details on warnings and other important information.

NOTICE

For optimal performance, all devices paired with the Descent S1 device should be updated to the latest software version. Failure to update devices may result in compatibility or functionality issues.

Device Overview

The Descent S1 dive buoy features the following:

• 1. Power Button: (See “Powering the Buoy On or Off”, page 3)
• 2. Status LED: (See “Status LED”, page 4)
• 3. Side Attachment Point: For a surface or boat marker buoy. (See “Buoy Placement Tips”, page 9)
• 4. Bottom Attachment Point: For an anchor. (See “Buoy Placement Tips”, page 9)

Getting Started

When you use your buoy for the first time, you should complete these tasks. To ensure compatibility when pairing devices, you must be in a location with internet access so your devices can download necessary software updates.

1. Charge the buoy. (See “Charging the Buoy”, page 3)
2. Power on the buoy. (See “Powering the Buoy On or Off”, page 3)
3. Configure the buoy using the Garmin Dive™ app. (See “Configuring the Buoy with the Garmin Dive App”, page 6)
4. Check for software updates. (See “Updating Device Software”, page 10)

For the best experience, keep your buoy software up to date. Software updates provide changes and improvements to functions, safety, and privacy.

5. Create a dive network by pairing each diver’s Descent dive computer and transmitter with other divers and the buoy. (See “Dive Network”, page 6)
6. Start a dive session. (See “Starting a Dive Session”, page 8)

Charging the Buoy

CAUTION

This device contains a lithium-ion battery. Refer to the Important Safety and Product Information guide in the product box for more details on warnings and other important information.

NOTICE

To prevent corrosion, clean and dry the contacts and the area underneath completely before charging or connecting to a computer. Refer to the cleaning instructions (See “Device Care”, page 10).

1. Press the sides of the charging clip.
2. Align the clip with the contacts on the bottom of the buoy and release the clip.
3. Connect the cable to a USB-C charging port or a wall adapter (minimum 5 W output power).

The status LED indicates the battery charge level:

Powering the Buoy On or Off

• To power on the buoy, press and hold the button for two seconds until you hear a beep. The buoy emits a beep, and the status LED flashes green while the buoy is on. A tone sounds, and the status LED flashes slowly white when the buoy can be connected to.
• To power off the buoy, press and hold the button for five seconds until you hear a beep. The status LED is solid white while you are pressing the button, and a tone sounds when the buoy is powered off.

Status LED

System Status

Connectivity Status

Charging Status

Diving

You can use a compatible Descent dive computer paired with a Descent T2 transmitter and the Descent S1 buoy to start a dive activity. During the dive, surface users can send and receive messages with divers, view their approximate location, and monitor their depth and tank pressure. Underwater divers can send messages to the surface and navigate back to the buoy using the location data displayed on the dive computers. At the end of the dive, divers can sync their dive computers with the buoy to view underwater thermal maps in the Garmin Dive app. Refer to the Descent dive computer owner’s manual for more information.

Dive Warnings

CAUTION

Do not exceed the maximum operating depth for diving activity of the device (Specifications, page 11).

Ensure you fully understand the use, displays, and limitations of your device. If you have questions about this manual or the device, always resolve any discrepancies or questions before diving with the device. Always remember that you are responsible for your own safety.

When properly configured and connected to a compatible device, this device can track the estimated tank pressure of a connected diver. This device is for informational purposes only and should not be considered the sole source of information.

Perform pre-dive safety checks, such as proper device function and settings, display function, battery level, tank pressure, and bubble checks to prevent leaks in hoses and connections.

For safety reasons, you should never dive alone. Dive with a buddy, even if your dive is being monitored from the surface. You should also remain in the presence of other people for a prolonged period after a dive, as the possible onset of decompression sickness (DCS) may be delayed or triggered by surface activities.

This device is not intended for commercial or professional diving activities. It is for recreational purposes only. Commercial or professional diving activities may expose the user to extreme depths or conditions that increase the risk of DCS.

Dive Care

CAUTION

Dive and navigation messages require a line of sight between two compatible receivers with the latest compatible software versions. Obstructions and other environmental factors can affect receiver connectivity and may delay or prevent message sending and receiving. With good connectivity, data can be sent successfully between divers in less than 20 seconds. If connectivity is weak, devices will attempt to send data for up to two minutes. This is a supplementary feature that should not be relied upon as a method for receiving emergency assistance and should not replace traditional dive safety tools and procedures.

To send messages and/or track the location of compatible devices, this device must be connected to a compatible mobile device using the device’s Wi-Fi connection and the Garmin Dive app. The connectivity range of the device’s Wi-Fi connection varies depending on the make and model of the mobile device used. This device should not be considered a method for receiving emergency assistance and should not replace traditional dive safety tools and procedures.

Surface conditions can affect the function and connectivity of the device. Certain objects, including, but not limited to, boat hulls, floating platforms, reefs, or seaweed, can block the device’s signal and cause delays or failures in data transmission.

You should not rely solely on the buoy for underwater navigation. The navigate-to-buoy feature requires the buoy to be in line of sight. Buoy location and distance information are not precise, and should be used as a supplement, not a substitute, for diver navigation, search, and positioning training.

This device is not personal flotation equipment and does not support the weight of a person or any dive equipment. Using this device in such a manner may result in personal injury and/or loss or damage to property.

The range and availability of device messaging and/or location tracking depend on the type of compatible devices with which this communication is made (See “Feature and Dive Product Compatibility”, page 12).

NOTICE

For best results, ensure this device is connected to a surface line, surface marker buoy, or anchor line that is not obstructed by the boat hull and allows a clear line of sight to compatible devices.

If you are towing the device, ensure it is attached to a suitable marker buoy and surface marker buoy so it is visible to vessels. A flag should not be attached directly to the buoy.

Submerging the device for extended periods may degrade device performance and/or damage it.

Configuring the Buoy with the Garmin Dive App

Before using the buoy for the first time, you must connect to it with the Garmin Dive app and configure the Wi-Fi connectivity. To ensure compatibility when pairing devices, you must be in a location with internet access so your devices can download necessary software updates.

1. To power on the buoy, press and hold the button for two seconds until you hear a beep. The buoy emits a beep, and the status LED flashes green while the buoy is on. A tone sounds, and the status LED flashes slowly white.
2. Select an option:
   • Download the Garmin Dive app using the mobile device you will use on the surface during the dive.
   • If you already have the Garmin Dive app on your mobile device, update it to the latest version.
3. Scan the QR code on the bottom of the buoy with your mobile device’s camera. When your mobile device connects to the buoy’s Wi-Fi network, the status LED is solid cyan for three seconds. Then, the status LED blinks twice in white while your mobile device is connected. OBSERVATION: You can connect manually to the buoy’s Wi-Fi network in your mobile device’s system settings. The Wi-Fi network name is “DescentS1-” followed by the six-digit device ID, located near the QR code. On your mobile device, select your buoy’s Wi-Fi network and enter “TSB” followed by the six-digit ID.
4. (Optional) In the Garmin Dive app, you can change the Wi-Fi network password. OBSERVATION: If necessary, you can change the Wi-Fi password later in the Garmin Dive app. Select More > Garmin Devices, select the buoy, and select General > Manage Wi-Fi Password.

Dive Network

When pairing your devices, the Descent S1 buoy creates a dive network that connects surface users using the Garmin Dive app with divers below the surface using either a Descent dive computer or the Descent T2 transmitter. At the end of the dive, the buoy syncs with the dive computers, and each user can view their underwater thermal maps for approximate location information in the Garmin Dive app. Refer to the Descent dive computer owner’s manual for more information.

Pairing Dive Computers and Transmitters

For more information on pairing and software updates, refer to the Descent device owner’s manual. To ensure compatibility when pairing devices, you must be in a location with internet access so your devices can download necessary software updates.

• Pair each user’s dive computer with a Descent T2 transmitter and set the location to My Tank.
• Pair each user’s dive computer with the Garmin Dive app on the phone.
• Check for software updates for each user’s Descent dive computers and Descent T2 transmitters using the Garmin Dive app.
• Pair each user’s dive computer with another diver’s Descent T2 transmitter and set the location to Other diver.

Pairing Dive Computers Using Bluetooth

You can pair compatible Descent dive computers with the buoy using Bluetooth or Wi-Fi technology (See “Pairing Dive Computers Using Wi-Fi”, page 8).

OBSERVATION: Descent Mk2i dive computers can only be paired via Wi-Fi technology.

1. Pair all Descent dive computers and transmitters and check for software updates (See “Pairing Dive Computers and Transmitters”, page 7).
2. Position compatible Descent dive computers within 10 m (33 ft) of the buoy.
3. To power on the buoy, press and hold the button for two seconds until you hear a beep. The buoy emits a beep, and the status LED flashes green while the buoy is on. A tone sounds, and the status LED flashes slowly white.
4. Press the button twice to enter Bluetooth pairing mode. A tone sounds, and the status LED flashes blue when pairing can begin. OBSERVATION: You must wait approximately 0.5 seconds between button presses. The buoy does not register rapid button presses.
5. On the dive computers, select Dive Setup > Dive Network and Air Integration > Buoys > Add New.
6. Select the buoy ID that corresponds to the number printed on the bottom of the buoy next to the QR code.
7. Press BACK, select SubWave Features, and confirm that Location Sharing and Messages are enabled.
8. Repeat steps 5 to 7 for all dive computers you intend to use on the dive.
9. Press the button twice to exit Bluetooth pairing mode. A tone sounds, and the status LED flashes white when Wi-Fi connectivity mode is activated.

The next time the buoy and paired dive computers are powered on and within wireless range, they will connect automatically.

Starting a Dive Session

CAUTION

For best results, you should calibrate the compass before each dive. Failure to calibrate the compass may result in poor location data, and divers may receive incorrect direction information for the buoy.

NOTICE

Calibrate the electronic compass outdoors. To improve direction accuracy, move away from objects that affect magnetic fields, such as vehicles, buildings, and power lines.

Before starting a dive session, you must configure the buoy with the Garmin Dive app (See “Configuring the Buoy with the Garmin Dive App”, page 6) and set up the dive network for all divers in the group (See “Dive Network”, page 6).

1. To power on the buoy, press and hold the button for two seconds until you hear a beep. The buoy emits a beep, and the status LED flashes green while the buoy is on. A tone sounds, and the status LED flashes slowly white.
2. On your mobile device, open the system settings and connect to the Descent S1 buoy’s Wi-Fi network.
3. In the Garmin Dive app, select More > Garmin Devices, choose the buoy, and select Start Session.
4. Follow the on-screen instructions to calibrate the compass by slowly rotating the device on all three axes. The Garmin Dive app will indicate when calibration is complete.
5. Select Divers and confirm that all divers are listed.
6. Use a rope to attach the buoy to the boat or surface marker buoy and place the buoy in the water (See “Buoy Placement Tips”, page 9).
7. Start the dive and use the Garmin Dive app to monitor divers from the surface.
8. Select Location to view the approximate location of underwater divers.

TIP: Divers can navigate back to the buoy during the dive using the location data displayed on their dive computers. Refer to the Descent owner’s manual for more information.

9. Select Messages to send messages to one or more divers and view received messages.
10. Select Stats to view data about each diver’s depth and tank pressure.
11. At the end of the dive session, select: > Exit Session.

At the end of a dive, when the paired dive computers are out of the water and within range of the buoy, they connect and sync automatically, and you can view underwater thermal maps in the Garmin Dive app for approximate location information. If necessary, select Dive Setup > Dive Network and Air Integration > Buoys, select the buoy, and select Sync to manually sync with the buoy after the dive.

Buoy Placement Tips

Diagram: A boat on the surface with a buoy attached by a rope. Divers are in the water below. Some divers are near the buoy, while others are further away. Red 'X' marks indicate areas where the buoy's signal might be obstructed.

• For boat mooring, attach the boat or anchor rope to the side attachment point of the Descent S1 buoy.
• For divers towing the buoy, attach the surface marker buoy rope to the side attachment point of the Descent S1 buoy, with the diver’s spool attached to the surface marker buoy.
• To anchor the buoy, attach the anchor rope to the bottom attachment point of the Descent S1 buoy. To increase visibility, attach another surface marker buoy rope to the side attachment point of the Descent S1 buoy. Do not attach a flag directly to the buoy.
• For best results and to maximize connectivity, position the buoy within 60 m (197 ft) of the surface support and in the direction of the dive site.
• Ensure the buoy has an unobstructed line of sight to the divers below the surface. Any obstructions, such as the boat hull or underwater objects, can interfere with sending and receiving data.

Garmin Dive App

The Garmin Dive app allows you to upload your dive logs from your compatible Garmin device. You can add more detailed information about your dives, including environmental conditions, photos, notes, and dive buddies. You can use the map to search for new dive locations and view location details and photos shared by other users. When diving with a Garmin buoy and compatible Garmin devices, you can view your underwater thermal maps for approximate location information.

The Garmin Dive app syncs your data with your Garmin Connect™ account. You can download the Garmin Dive app from your smartphone’s app store (garmin.com/diveapp).

Updating Device Software

You can use the Garmin Dive app to update the Descent S1 buoy software by connecting your mobile device using Wi-Fi technology.

1. Connect your mobile device to the buoy’s Wi-Fi network (See “Configuring the Buoy with the Garmin Dive App”, page 6).
2. In the Garmin Dive app, select More > Garmin Devices.
3. Select the buoy from the list of devices.
4. Select General > Check for Updates.

The app checks for a software update and prompts you to install it if one is available.

Device Care

CAUTION

Do not use sharp objects to clean the device.

NOTICE

Avoid chemicals, solvents, and insect repellents that can damage plastic components and finishes.

Rinse the device with plenty of water after exposure to chlorine, saltwater, sunscreen, cosmetics, alcohol, or other abrasive chemicals. Prolonged exposure to these substances can damage the coating.

Avoid hard impacts and rough handling, as it may shorten the product’s lifespan.

Do not place the device in locations with prolonged exposure to extreme temperatures, as this can cause permanent damage.

If the device is damaged or stored at a temperature different from the specified range for storage temperature, discontinue use.

Cleaning the Buoy

1. After each dive, rinse the buoy with fresh water to remove salt and debris.
2. If necessary, wipe the buoy with a soft cloth.

Long-Term Storage

When you do not plan to use the Descent S1 device for several months, charge the battery to at least 50% before storing it. You should store the device in a cool, dry location with temperatures around the typical household level. After storage, you should fully recharge the device before using it.

Specifications

¹The device is resistant to continuous immersion in water up to 10 m. For more information, visit www.garmin.com/waterrating.

Troubleshooting

Getting More Information

• You can find more information about this product on the Garmin website.
• Visit support.garmin.com for additional manuals, articles, and software updates.
• Visit buy.garmin.com or contact your Garmin dealer for information on optional accessories and replacement parts.

Resetting the Buoy

You can reset the buoy to remove all paired devices and reset the Wi-Fi password.

1. With the buoy powered off, press and hold the button for ten seconds until you hear three beeps. The status LED is solid green while you are pressing the button and blinks orange while the buoy is resetting.
2. Wait for the buoy to reset. The buoy emits a single beep, and the status LED flashes green while the buoy is on. A tone sounds, and the status LED flashes slowly white when the buoy can be connected to.

Feature and Dive Product Compatibility

You can pair multiple Descent devices to form a dive network for you and your fellow divers. Not all functions are available on all devices. Refer to the Descent device owner’s manual for more information.

NOTICE

To access all features and improvements, you must update your devices to the latest software versions. If software versions are incompatible, the following alert is displayed on the dive computer: Transmitter connection failed %1. “%1” is replaced by the transceiver name.

View tank pressure for you and connected divers.

View diver depth for connected divers.

View diver distance for connected divers.

View direction of connected divers.

View public transceiver names for you and connected divers.

Send preset messages to divers with a Descent T2 transmitter or to the surface with the Descent S1 buoy.

Receive messages from divers during the dive with a paired Descent T2 transmitter or from the surface with the Descent S1 buoy.

View distance and direction information to navigate back to the Descent S1 buoy.

About SubWave Technology

Compatible Descent devices use SubWave sonar technology to communicate with other compatible Descent devices. Various factors can affect device communication. For more information, visit garmin.com/subwave.

Troubleshooting

support.garmin.com