What do the LEDs indicate?

The indicators provide the following functions:
• Green (Power) - this indicator is illuminated whilst the unit is powered
• Yellow (TX AIS) - this indicator flashes to indicate AIS transmissions
• Yellow (TX VHF) - this indicator flashes to indicate VHF radio transmissions
Note that both the TX AIS and TX VHF LEDs may illuminate when the AIS antenna splitter is used with some brands of VHF radio at the high output power (25W) setting. This is normal behavior and does not indicate a fault.