Keeping your Furuno GPS software up to date is essential for maintaining accurate navigation, reliable GPS performance, and compatibility with the latest marine technologies. Software updates often include bug fixes, enhanced GPS accuracy, improved system stability, better chart compatibility, and new features that enhance your overall boating experience.

Whether you own a Furuno NavNet TZtouch, GP-39, GP-1971F, GP-1871F, or another compatible Furuno navigation device, installing the latest software ensures your GPS continues to operate efficiently and reliably.

This comprehensive guide explains how to update Furuno GPS software, what you need before starting, and how to troubleshoot common update issues.

Why Update Your Furuno GPS Software?

Regular software updates provide numerous benefits, including:

• Improved GPS positioning accuracy
• Faster satellite acquisition
• Better navigation performance
• Enhanced chart compatibility
• Bug fixes and performance improvements
• Improved touchscreen responsiveness
• Better integration with radar, sonar, and AIS
• Increased system stability
• Support for newly released features
• Improved overall reliability

Keeping your software current also helps reduce the likelihood of navigation errors and unexpected system problems.

Which Furuno GPS Devices Support Software Updates?

Many Furuno marine navigation products support software updates, including:

• Furuno NavNet TZtouch Series
• Furuno NavNet TZtouch2
• Furuno NavNet TZtouch3
• Furuno GP-39 GPS Navigator
• Furuno GP-1971F
• Furuno GP-1871F
• Furuno GP-3700
• Furuno Multifunction Displays (MFDs)
• Furuno Fish Finders
• Furuno Radar Systems
• Furuno Integrated Navigation Systems

The exact update process may vary depending on the model.

Before Updating Furuno GPS Software

Preparation is important for a successful update.

Before you begin:

• Back up your routes and waypoints.
• Save any custom system settings.
• Check your current software version.
• Ensure your vessel has a reliable power supply.
• Use a compatible SD or microSD card if required.
• Read the installation instructions for your specific Furuno model.

Avoid updating your device while underway.

What You'll Need

Prepare the following items:

• A computer with internet access
• Compatible SD or microSD card
• SD card reader
• Latest Furuno software update package
• Furuno GPS device
• Stable power source

Step 1: Check Your Current Software Version

Before installing an update:

1. Turn on your Furuno GPS.
2. Open the Menu.
3. Navigate to System Settings.
4. Select System Information.
5. Record the installed software version.

This helps determine whether your GPS requires an update.

Step 2: Download the Latest Software

Download the correct software package for your exact Furuno model.

Be sure to obtain:

• Latest software update
• Installation instructions
• Release notes
• Supporting files if required

Always verify that the software matches your device model before installation.

Installing incorrect software may cause system errors or prevent the GPS from functioning properly.

Step 3: Prepare the SD Card

Insert your SD card into your computer.

Then:

1. Format the card if recommended.
2. Extract the downloaded software package.
3. Copy the update files to the SD card.
4. Do not rename or move any files.
5. Safely eject the card.

Proper file placement is essential for successful installation.

Step 4: Insert the SD Card into the Furuno GPS

1. Turn off your Furuno GPS.
2. Insert the prepared SD card into the appropriate slot.
3. Turn the GPS back on.
4. Wait for the device to recognize the update files.

Some models automatically detect software updates, while others require manual installation.

Step 5: Install the Software Update

Navigate to:

Menu → System → Maintenance → Software Update

Select:

• Software Update
• System Update
• Install Update

Follow the on-screen instructions to begin installation.

Step 6: Wait for the Installation to Complete

Software installation generally takes 5–30 minutes, depending on the model and update size.

During the installation:

• Do not disconnect power.
• Do not remove the SD card.
• Do not press unnecessary buttons.
• Allow automatic restarts to complete.

Interrupting the process may result in software corruption.

Step 7: Restart the GPS

After installation:

• Remove the SD card if instructed.
• Restart the Furuno GPS.
• Allow the device to complete initialization.

The first startup after updating may take slightly longer than normal.

Step 8: Verify the Software Update

Once the device restarts:

1. Return to System Information.
2. Confirm that the software version has been updated.
3. Test GPS positioning.
4. Verify chart display.
5. Check connected radar, sonar, and AIS systems if applicable.

If everything functions correctly, the update was successful.

Tips for a Successful Furuno GPS Software Update

For the best results:

• Use only software intended for your exact Furuno model.
• Keep the device connected to a stable power source.
• Back up important navigation data.
• Use a reliable SD card.
• Carefully follow the included installation instructions.
• Update software before installing new chart data.
• Test the GPS after completing the update.

Common Furuno GPS Software Update Problems

GPS Does Not Detect the Update

Possible causes:

• Incorrect software package
• Improper SD card formatting
• Unsupported SD card
• Incorrect file structure

Solution:

• Reformat the SD card.
• Download the software again.
• Verify the update files are copied correctly.

Software Installation Freezes

Possible causes:

• Corrupted update files
• Interrupted power
• Faulty SD card

Solution:

• Restart the update.
• Use another SD card.
• Download a fresh copy of the software.

GPS Won't Restart After Updating

Possible causes:

• Incomplete installation
• Corrupted software

Solution:

• Wait several minutes.
• Attempt a normal restart.
• Reinstall the software if necessary.

GPS Cannot Find Satellites

Possible causes:

• GPS receiver rebuilding satellite data
• Antenna issue
• Configuration changes

Solution:

• Move to an open area.
• Wait 10–20 minutes.
• Inspect the antenna.
• Restart the GPS.

Connected Marine Electronics Stop Communicating

Possible causes:

• Network configuration changes
• Software compatibility issues

Solution:

• Restart the marine network.
• Check Ethernet and NMEA connections.
• Update connected devices if required.

Best Practices After Updating

After the software update:

• Verify GPS accuracy.
• Test route planning.
• Confirm chart loading.
• Check radar operation.
• Test sonar functionality.
• Verify AIS communication.
• Ensure autopilot integration works correctly.

Performing these checks before your next trip helps ensure dependable operation.

How Often Should You Update Furuno GPS Software?

It's recommended to check for software updates:

• Every 3–6 months
• Before boating season
• Before long offshore trips
• After installing new marine electronics
• When new software releases become available
• If you experience recurring system issues

Routine updates help maintain performance, reliability, and compatibility.

Frequently Asked Questions

Can I update Furuno GPS software myself?

Yes. Most Furuno GPS units and multifunction displays allow users to install software updates using an SD card and the appropriate update files.

Will updating the software erase my routes?

Software updates generally do not remove saved routes or waypoints. However, backing up your navigation data before updating is strongly recommended.

How long does a Furuno GPS software update take?

Most software updates require 5 to 30 minutes, depending on the device model and the size of the update.

What should I do if the update fails?

Restart the GPS, verify that you downloaded the correct software, check the SD card, and repeat the installation according to the official instructions.

Should I update my charts after updating the software?

Yes. Updating your marine charts after installing the latest software ensures compatibility and provides the most accurate navigation information.

Conclusion

Regular Furuno GPS software updates are essential for maintaining accurate navigation, improving system performance, and ensuring compatibility with the latest marine charts and onboard electronics. By checking your current software version, preparing the correct update files, installing the update carefully, and testing your GPS afterward, you can keep your Furuno navigation system operating at its best. Combined with routine maintenance and up-to-date charts, regular software updates help ensure dependable performance and greater confidence on every voyage.