[TG] [TG11] AIS 950 EPFS is lost

[CYOAJay]

I am working on a client's boat and getting an error message of EPFS lost. I was told that this is likely a problem with setting for the ECDIS port (set for bi-directional).

I have no clue how to change or test this? Any insight would be helpful.

Thanks,

[Tom - Raymarine - Moderator]

Hello CYOAJay,

EPFS Lost means that the AIS is no longer getting position data from the external GPS receiver and has reverted to its internal receiver. This is an IMO-mandated standard warning. What is the external GPS source? Can you check its IEC61162-2 (AKA NMEA0183) connection to the relevant Sensor port, and that it does definitely have a good GPS fix?

I've seen this warning before on a series of boats that had an installation issue that caused severe noise that was corrupting NMEA/IEC traffic, but it could be as simple as that the external antenna doesn't have a good sky-view.

Regards,
Tom