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A Lowrance GPS can sometimes lose its satellite signal while you are using it. When this happens, the device may stop showing your current position, display an old location, or show a message indicating that the GPS signal has been lost. Signal loss can be caused by several factors, including poor satellite visibility, antenna problems, power interruptions, incorrect settings, software issues, or interference from nearby equipment.

A lost GPS signal does not necessarily mean that the Lowrance unit is damaged. Simple troubleshooting can often help identify the reason for the problem and restore normal positioning. This guide explains quick ways to troubleshoot a Lowrance GPS signal lost issue.

Check the Satellite View

Start by checking whether the GPS has a clear view of the sky.

Large objects such as buildings, bridges, trees, and other structures can reduce satellite visibility. If the GPS antenna cannot receive enough satellite information, the device may lose its position.

Move to an area with a clearer view of the sky when possible. Allow the GPS some time to search for satellites and check whether the position returns.

Restart the Lowrance GPS

A temporary software or communication problem can cause the GPS signal to disappear.

Turn the Lowrance unit off completely and wait briefly before powering it back on. After restarting, allow the device to complete its startup process.

Keep the GPS in an open location while it searches for satellites. If the signal returns after the restart, the issue may have been temporary.

Check the Power Supply

An unstable power connection can cause GPS signal loss or unexpected device behavior.

Inspect the power cable and connection points. Look for loose fittings, damaged wiring, corrosion, or moisture.

Make sure the Lowrance unit is receiving stable power. If the device repeatedly restarts or shuts down along with the signal loss, the power system may require further inspection.

Inspect the GPS Antenna

The GPS antenna needs to receive satellite signals properly. Depending on your Lowrance model, it may be built into the unit or connected externally.

If an external antenna is being used, check its cable and connector. Make sure the connection is secure and inspect the cable for visible damage.

Also check the antenna's location. A blocked or poorly positioned antenna may experience weaker reception and repeated signal loss.

Check the Antenna Connection

A loose antenna connector can cause intermittent GPS reception.

Inspect the connector carefully and look for corrosion, moisture, dirt, or signs of physical damage.

If the connection is loose, make sure it is properly seated according to the equipment's installation requirements. Avoid forcing damaged connectors.

Review the GPS Source

Some navigation systems can use more than one positioning source. If the wrong source is selected, the Lowrance display may report a missing or lost GPS signal.

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

After making any change, allow the system time to establish a position and check whether the signal returns.

Allow Time for Satellite Acquisition

The GPS may need some time to reacquire satellites after losing its signal.

Keep the device powered on in an open location and avoid repeatedly restarting it. Give the system time to search for available satellites.

If the position returns after waiting, the loss may have been temporary and related to satellite acquisition.

Check Whether the Signal Is Intermittent

Pay attention to when the GPS signal is lost.

If the signal disappears only in certain locations, the surrounding environment may be responsible. If it disappears when certain electronic devices are switched on, interference may be involved.

If the signal repeatedly disappears even in open areas, inspect the antenna, power supply, connections, and software.

Look for Electronic Interference

Nearby electronics can sometimes affect GPS performance depending on the installation.

Check whether the signal is lost when other navigation or electronic equipment is operating. If possible, temporarily switch off nonessential equipment and observe the GPS.

If the signal becomes stable after another device is turned off, further investigation of the installation or equipment may be necessary.

Inspect Connected Equipment

Your Lowrance GPS may communicate with other displays, sensors, antennas, or navigation components.

A loose cable or communication problem can affect the information shown on the main unit.

Inspect accessible connections and make sure connected equipment is properly powered. If multiple GPS sources are available, verify that the correct source is selected.

Check Maps and Charts

A lost GPS signal and a map problem are separate issues.

If the GPS position disappears but other map information remains visible, focus on GPS reception and positioning. If the map itself is missing or behaving incorrectly, check the chart data separately.

If a chart card is being used, make sure it is inserted properly and recognized by the device.

Check the Memory Card

A memory card can occasionally contribute to unexpected system behavior if it is damaged or not being recognized properly.

If your Lowrance unit uses a memory card, turn off the device when appropriate before removing it. Inspect the card for visible damage, dirt, or moisture.

Reinsert the card correctly and restart the GPS. If the signal behavior changes after removing the card, the card or its stored data may require further investigation.

Check for Software Updates

Software issues can sometimes affect GPS reception, positioning, or communication.

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

Do not interrupt the unit while an update is being installed. If the signal-loss problem began after a software change, note that information when troubleshooting.

Test the GPS in an Open Location

Testing the Lowrance GPS in a different open area can help determine whether the signal loss is environmental.

If the GPS works normally in an open location but loses the signal in another area, signal blockage or interference may be responsible.

If the signal continues to disappear in several suitable locations, investigate the GPS receiver, antenna, power supply, and connected equipment.

Check for Error Messages

Pay attention to any message displayed when the GPS signal is lost.

Record the exact wording of recurring messages. Information about satellite reception, GPS availability, antenna communication, or system status can help identify the cause.

If the same message appears repeatedly after restarting the unit, professional troubleshooting may be necessary.

Avoid an Immediate Factory Reset

A factory reset should generally not be the first response to GPS signal loss.

Resetting the device may remove customized settings and preferences. Try simpler troubleshooting methods first, including checking the antenna, power, GPS source, satellite visibility, and connected equipment.

If a reset becomes necessary, understand what settings may be affected before proceeding.

Contact Professional Support

If the Lowrance GPS repeatedly loses its signal despite having a clear view of the sky and stable power, the problem may involve the antenna, GPS receiver, software, or another hardware component.

Keep your device model information and any error messages available when seeking assistance. Explain whether the signal is completely lost or only drops occasionally.

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

Final Thoughts

A Lowrance GPS signal lost problem can be frustrating, but it does not always indicate a permanent device failure. Start by checking satellite visibility, restarting the GPS, and verifying the power and antenna connections.

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

By checking each possible cause individually, you can better understand why the Lowrance GPS keeps losing its signal and determine whether a simple adjustment can restore reliable positioning or professional assistance is required.