The Aids to Navigation unit can either just transmit message 21 with AtoN status or it can together with LightGuard send and receive message 6 with monitoring and control information.
The unit is available in both Type 1 (transmit only via FATDMA channel access) and Type 3 (transmit and receive using RATDMA channel access) configuration. The LGA unit supports all the standard AIS message types. Advanced functions such as chaining and VDL configuration are also supported. In standard configuration it can be directly interfaced to a Sabik lantern for updating the lantern health and ON/OFF status in the message 21.