• Ensure proper power is supplied to the unit for operation.
• Check and clean connections between the display portion of the unit and the GPS module. There may be an intermediary connection on a power cable that the GPS module connects to. Clean all connections with an anti-corrosion cleaner for electronics as needed.
• Reset the unit. Resets for your particular unit are available HERE.

If problems persist following the reset and voltage and connections have been verified, the unit or module may be faulty. You may be able to verify the faulty component by checking the unit or module against a similar, known good device for confirmation.

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• Ensure proper power is supplied to the unit for operation.
• Check and clean connections between the display portion of the unit and the GPS module. There is only one connection located on the back of the unit. This is a standard SMB Coaxial connector. Be sure to clean both sides (cable and unit).
• If a Volt Meter is available, check the voltage across the center and shield of this connector on the back of the unit. Normal operation will have a 5V DC reading.
• Reset the unit. Resets for your particular unit are available HERE.

If problems persist following the reset and voltage and connections have been verified, the unit or module may be faulty. You may be able to verify the faulty component by checking the unit or module against a similar, known good device for confirmation.

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• Ensure proper power is supplied to the unit for operation.
• Check and clean connections between the display portion of the unit and the GPS module. Clean all connections with an anti-corrosion cleaner for electronics as needed. There may be an extension cable in use. For diagnostic purposes, bypass the extension and connect the GPS module directly to the back of the unit. This places the module only 12-16 inches from the unit.
• Isolate the RS-232 communications (NMEA-0183) cable. This will have 4 wires, yellow/Orange/Blue/Shield. Tape each wire individually and then together if not using the NMEA communications.
• Update the unit to the latest software version. Units initially released to operate with LGC-12S modules will likely require an update to function with the newer LGC-12W. It is also a good idea to update to the latest release if not already. Updates can be found by following this link.
• Reset the unit. Resets for your particular unit are available HERE.

If problems persist after performing the troubleshooting above, you may wish to check the operation of the unit or module against a similar, known good unit that uses the same module. DO NOT connect and Eagle EGC-12W to a Lowrance system. This will alter the baud rate of communication which will no longer allow the EGC-12W to communicate properly with the Eagle GPS product.

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• Ensure proper power is supplied to the unit for operation. Follow trouble shooting for blue connector unit power related issues here  or red connector unit power related issues here if needed.
• Ensure proper power is being provided to the GPS module. If not configured for a network, power should also be applied to the NMEA 2000 Power cable. Apply the red wire to a fused (3A) +12V supply. Ground both the black wire and the shielded ground (bare wire). To determine if an interruption in power is preventing the GPS operation, review this document.
• Check and clean connections between the display portion of the unit and the GPS module. A minimum of two connections will be in the cabling and possibly more. Trace the cable and clean contacts at each connector as needed. Clean all connections with an anti-corrosion clean for electronics as needed.
• Ensure that a Liner Architecture is observed if using a LowranceNET or NMEA 2000 network.
• Check the terminating resistor(s). There may be one 60 Ohm terminator or two 120 Ohm terminators. Simply check the short end of the Y cable. If a hard plastic "T" is in use, check the end for the terminator. Any evidence of scorch or fowling may indicate a replacement terminator or cable should be obtained.
• Isolate the RS-232 communications (NMEA-0183) cable. This will have 4 wires, yellow/Orange/Blue/Shield. Tape each wire individually and then together if not using the NMEA communications.
• Update the unit and the GPS module to their latest software version. If an earlier version of software for a module is operated with an newer version of the unit, communications may not function properly. Update the unit and GPS module accordingly by following this link. 
• Reset the unit. Resets for your particular unit are available HERE.
• After updating, check the NMEA 2000 Bus. Press menu from a main operating page and select the NMEA 2000 menu and choose the Bus Setup option. If other devices on the network are visible, check the connection at the GPS module to the network as well as other cabling between the module and other properly operating devices. If the LGC-2000 is visible, select this option to view data for software version, and additional data. The status may indicate not-configured or OK. If not configured, change the instance to 255.
• Reset the network by removing power from the NMEA 2000 power cable. Keep power off for a couple minutes to allow all devices to properly reset. Reapply power to the network.

If problems persist, it is difficult to determine the actual fault due to the cables, terminators and other devices in use. Attempting operation on another available system to isolate the communication error is ideal if possible.

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