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Lowrance GPS devices are useful for navigation and positioning, but an error code can sometimes appear when the system detects a problem. GPS error codes may be related to satellite reception, positioning, antenna communication, power, software, connected equipment, or other system conditions.

When an error code appears, it is important to understand what the device is reporting before making major changes. A simple restart or connection check may resolve some temporary errors, while repeated messages may require additional troubleshooting.

This guide explains quick and practical ways to troubleshoot common Lowrance GPS error-code problems.

Note the Exact Error Code

The first step is to identify the exact message or error code shown on the Lowrance display.

Do not immediately restart the device if the message contains useful information. Write down the error code and any description that appears with it.

Different messages can indicate different types of problems. Knowing the exact code can make troubleshooting much easier and prevent unnecessary changes.

Restart the Lowrance GPS

A temporary software or communication problem can sometimes trigger an error code.

Turn the Lowrance unit off completely and wait briefly. Then power it back on and allow the system to complete its startup process.

Once the main screen loads, give the GPS enough time to search for satellites. If the error does not return, the original message may have been caused by a temporary system issue.

Check the GPS Signal

Many GPS-related errors can occur when the device cannot obtain enough satellite information.

Move the unit to an area with a clearer view of the sky. Buildings, trees, bridges, and other structures can interfere with satellite reception.

Allow the device some time to acquire satellites. If the error disappears after the GPS obtains a strong signal, poor satellite visibility may have been the cause.

Inspect the GPS Antenna

If your Lowrance setup uses an external GPS antenna, inspect the antenna and its connection.

Check the cable for visible damage and make sure the connector is secure. Look for corrosion, moisture, or loose connections.

The antenna should also be installed in a suitable location with a good view of the sky. A blocked or poorly positioned antenna can contribute to GPS reception errors.

Check the Power Supply

Unstable power can cause unexpected error messages, freezing, restarting, or loss of GPS functionality.

Inspect the power cable and connection points. Make sure the connections are secure and check for visible damage or corrosion.

If the device repeatedly shuts down or restarts along with the error message, the power supply should be investigated carefully.

Review GPS Source Settings

If multiple GPS receivers or navigation devices are connected, the system may be using an incorrect positioning source.

Open the GPS or navigation settings and check the selected source. Make sure the intended GPS receiver is being used.

A wrong source selection can make the system appear to have a GPS failure even when another connected receiver is functioning correctly.

Allow Time for Satellite Acquisition

After starting the device, do not assume that an error message means the GPS has permanently failed.

The unit may need time to establish communication with available satellites. This can be especially relevant after the device has been unused for a while or has been moved.

Keep the GPS in an open location and allow it time to acquire a position before making further changes.

Check the Displayed Position

If the error is related to positioning, check whether the GPS is showing a location.

Compare the displayed position with your actual location and observe whether the position updates as you move.

If the position is missing or remains unchanged, the problem may involve satellite reception, the selected GPS source, the antenna, or communication between connected components.

Inspect Maps and Charts

A map or chart problem can sometimes be mistaken for a GPS error.

Check whether your chart is loading correctly and whether the appropriate mapping information is available. If a chart card is being used, make sure it is inserted correctly.

If the GPS position is available but the map is not displaying properly, investigate the chart data separately.

Check the Memory Card

If the Lowrance unit uses a memory card, inspect the card if error messages continue to appear.

Turn the unit off when appropriate before removing the card. Check the card for visible damage, dirt, or moisture and make sure it is properly inserted.

Restart the device and check whether the error appears again. If the GPS operates normally without the card, the card or its stored data may be contributing to the problem.

Check for Software Updates

Outdated or problematic software can sometimes cause system errors.

Check whether a suitable software update is available for your specific Lowrance model. Follow the appropriate update instructions for the device.

Avoid interrupting the unit during the update process. If the error started after a recent software change, note that information because it may help identify the cause.

Inspect Connected Equipment

Lowrance navigation systems can be connected to other displays, sensors, antennas, and electronic equipment.

A communication problem with one of these components may generate an error message on the main unit.

Inspect accessible cables and connections. Make sure connected equipment is powered correctly and that the relevant devices are communicating as expected.

Check for Electronic Interference

Nearby electronic equipment can sometimes affect GPS reception or communication.

Observe whether the error appears when certain equipment is switched on. If possible, temporarily turn off nearby nonessential devices and check whether the GPS begins working normally.

If the error disappears when another device is switched off, interference or a connection problem may need further investigation.

Test the GPS in an Open Location

Testing the GPS somewhere with a clear view of the sky can help separate environmental problems from device problems.

If the error disappears in an open location, signal blockage or interference may have been responsible.

If the same error continues in several suitable locations, the problem may involve the GPS receiver, antenna, power supply, software, or another component.

Avoid Repeated Factory Resets

A factory reset should not normally be the first response to a GPS error code.

Resetting the unit can remove customized settings and may require the navigation system to be configured again.

Try basic troubleshooting first. If a factory reset becomes necessary, understand what settings may be affected before proceeding.

Keep Track of Repeated Errors

If the same error code keeps returning, note when and how it appears.

For example, check whether the error occurs immediately after startup, only in certain locations, when another device is operating, or after a particular function is selected.

This information can help identify patterns and make professional troubleshooting more effective.

Contact Lowrance Support

If an error code continues to appear after basic troubleshooting, professional assistance may be necessary.

Keep the exact error code, Lowrance model information, and details about what happens before the message appears. Explain whether the GPS has a satellite signal, whether the position is accurate, and whether other functions are working.

Avoid opening the unit or attempting internal repairs unless you have the appropriate technical knowledge.

Final Thoughts

Lowrance GPS error codes can indicate different types of problems, so the exact message is important when troubleshooting. Start by recording the error, restarting the device, checking the GPS signal, and inspecting the power and antenna connections.

You can then review the GPS source, maps, memory card, software, connected equipment, and possible electronic interference. Testing the unit in an open location can also help determine whether the problem is caused by the surrounding environment.

If the same error continues after these checks, professional assistance can help identify the underlying cause and determine the appropriate solution. Troubleshooting one possible cause at a time is usually the best way to handle Lowrance GPS error codes without making unnecessary changes.