Why is the red alarm icon flashing on my Raymarine AIS4000 Transceiver?
- TTimothy WilsonAug 16, 2025
The red alarm icon may illuminate or flash on your Raymarine Transceiver for several reasons: * The unit may not have a valid MMSI: Check that the AIS transceiver is correctly configured with a valid MMSI. * The VHF antenna may be faulty: Check the connection to the VHF antenna and ensure the VHF antenna is not damaged. * No GPS position fix can be obtained: Check the AIS transceiver's location to ensure the internal GPS antenna has a clear sky view, or verify that an external GPS antenna is properly connected and installed. * The power supply is outside the allowable range: Check that the power supply is within the range of 10.8VDC to 31.2VDC. * Check for error and alarm messages in the ‘Alarms’ menu.