trying to figure out before i call Raynarine. All of a sudden I'm getting a low battery warning and beeping. Battery's seem to be fine. I don't hear the start-up sound also.
If the batteries are OK, check the voltage at the connectors/connections to the AP. 99% of all electrical issues are connections. The other 1% are wiring size too small.
The low battery warning is unfortunately a sign that the control head is toast. Raymarine has no spares. You need a new unit.
Happened to me.
Tony