Noyafa NF-178 GPS Land Measuring Instrument: User Manual

1. Introduction

The Noyafa NF-178 is a versatile GPS land measuring instrument designed for accurate area and distance calculations. It features a 2.8-inch display and supports both manual and automatic measurement methods, making it suitable for various outdoor land surveying tasks.

Figure 1: Noyafa NF-178 GPS Land Measuring Instrument. This image displays the device with its screen showing GPS coordinates and date, set against a background of fields and mountains, indicating its outdoor use.

Key Features:

• 2.8-inch 320 x 240 display for clear data visualization.
• Measures any shape of land area and girth (excluding upland and slope).
• Capable of testing length or distance between any two points.
• Displays test data, graphic trajectory, and total calculation amount on screen.
• Supports both manual and automatic measurement methods.
• Multiple unit options: mu, square, hectare, and kilometers.

2. Safety Precautions and Important Notes

To ensure accurate measurements and safe operation, please observe the following guidelines:

• Outdoor Use: This device is designed for outdoor use in open areas. Avoid operating near tall obstructions such as buildings or dense trees, as these can interfere with GPS signal reception.
• Satellite Acquisition: The device requires a minimum of 6 satellites to be acquired before it can begin measurement operations. Ensure sufficient satellite lock for accurate results.
• Minimum Measurement Area: Do not attempt to measure land areas smaller than 0.3 mu (approximately 200 square meters), as accuracy may be compromised.
• Measurement Trajectory: When measuring, avoid crossing or overlapping your trajectory. Maintain a clear, non-intersecting path for precise area calculation.
• Coordinate Stability: Before initiating any measurement, verify that the Latitude and Longitude coordinates displayed on the device are stable. Unstable coordinates indicate poor GPS signal and will lead to inaccurate readings.

3. Product Overview

Familiarize yourself with the components and controls of your Noyafa NF-178 instrument.

Figure 2: Labeled components of the Noyafa NF-178. This diagram highlights the LCD screen, signal strength indicator, backlight button, LED light, length button, up/down navigation, OK/Enter button, Save button, Power button, Back button, charging port, and laser.

Component Identification:

• LCD Screen: Displays measurement data, coordinates, and menu options.
• Signal Strength Indicator: Shows the current GPS signal reception quality.
• Backlight Button: Activates or deactivates the screen backlight.
• LED Light: Provides illumination.
• Length Button: Initiates distance measurement.
• Area Button: Initiates area measurement.
• Up/Down Navigation Buttons: Used for menu navigation and value adjustment.
• Enter/OK Button: Confirms selections or actions.
• Save Button: Saves measurement data.
• Power Button: Turns the device on or off.
• Back Button: Returns to the previous menu or screen.
• Charging Port: For connecting the USB charging cable.
• Laser: Integrated laser for specific measurement tasks.
• Money Detection Light: (If applicable, based on image label)

4. Setup

4.1. Battery Installation and Charging

The Noyafa NF-178 comes with a pre-installed 3.7V/1000mAh lithium battery. Ensure the battery is properly seated before first use.

Figure 3: Battery compartment and USB charging port. This image illustrates the internal 3.7V/1000mAh lithium battery and the common USB charging port, highlighting the device's power solution.

• Charging: Connect the device to a standard USB power adapter using a common USB charging cable. The device supports multiple charging modes.
• Battery Life: A fully charged battery provides extended operation for outdoor measurements.

4.2. Initial Power On

Press and hold the Power button until the screen illuminates. The device will perform a self-check and attempt to acquire GPS satellite signals.

5. Operating Instructions

5.1. Manual Area Measurement

Follow these steps for manual area measurement:

1. Acquire Satellites: Ensure the device has acquired at least 6 satellite signals. The signal strength indicator on the screen will confirm this.
2. Enter Manual Testing Mode:
   • Navigate to the "Set" menu.
   • Select "Manual Testing".
   • Return to the main menu.
3. Start Area Measurement: From the main menu, select "Area" to begin.
4. Mark Points:
   • Walk along the perimeter of the land you wish to measure.
   • Press the Save button at each corner or significant point (e.g., A, B, C, D).
   • The device will record the GPS coordinates for each point.
5. Complete Measurement: After marking all points, return to the starting point (Point A). Press the OK button to finalize the measurement.
6. View Results: The calculated area and length will be displayed on the screen.
7. Save Data: Press the Save button to store the measurement data.

Figure 4: Manual testing procedure. This graphic illustrates the four steps for manual area measurement: satellite acquisition, entering manual testing mode, marking points (A, B, C, D), and viewing the final area and length results on the device screen.

The land graph can also be checked later from the saved data.

5.2. Distance Measurement

To measure the distance between two points:

1. From the main menu, select "Length".
2. Walk from the starting point to the end point.
3. The device will continuously display the distance covered.
4. Press Save to record the final distance.

5.3. System Settings

To customize device settings:

1. Navigate to the "Set" menu.
2. Use the Up/Down buttons to select options such as:
   • Area Unit Set: Choose between mu, square, hectare, etc.
   • Length Unit Set: Choose between kilometers, meters, etc.
   • Area Unit Price Set: (If applicable) Set a price per unit of area for automatic calculation.
3. Press Enter/OK to confirm your selection.
4. Use the Up/Down buttons to adjust the value, then press Enter/OK to save.

Figure 5: System settings interface. This image shows examples of the "Area unit set" and "Area unit price set" screens, demonstrating how users can customize measurement units and pricing within the device's settings.

5.4. Data Management

• Saving Data: After each measurement, press the Save button to store the results.
• Viewing History: Access saved measurements and graphic trajectories through the "History Data" option in the menu.
• Total Calculation: The device can display the total amount of calculation for accumulated measurements.

6. Maintenance

• Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
• Storage: Store the instrument in a cool, dry place away from direct sunlight and extreme temperatures.
• Battery Care: If storing for an extended period, ensure the battery is partially charged (around 50%) to prolong its lifespan. Recharge periodically.
• Avoid Impact: Protect the device from drops and impacts, which can damage internal components or the screen.

7. Troubleshooting

• No GPS Signal:
  • Ensure you are in an open outdoor area, away from tall buildings or dense foliage.
  • Wait for the device to acquire at least 6 satellites. This may take a few minutes.
• Inaccurate Measurements:
  • Verify that the GPS coordinates are stable before starting measurement.
  • Ensure your measurement trajectory does not cross or overlap.
  • Confirm the area being measured is not smaller than 0.3 mu.
• Device Not Powering On:
  • Check battery charge level. Connect to a charger and attempt to power on again.
  • Ensure the battery is properly installed.
• Screen Not Responding:
  • Try restarting the device by holding the power button.
  • If the issue persists, contact customer support.

8. Specifications

Figure 6: Contents of the Noyafa NF-178 package. This image shows the retail box, the NF-178 device, a user manual, and a protective carrying pouch, indicating the items included with the product.

9. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the warranty card included with your product or contact Noyafa customer service directly. Contact details are typically available on the manufacturer's official website.