Hi.

I am looking for the semantics of the various fields of the following nmea
sentences*:
- PBGTTBS (Brooks proprietary)
- PNKE,01 and PNKE,03 (NKE proprietary).

These sentences carry comparisons between the current behaviour of the boat
and the theoretical one stored in a reference polar. Does anyone know about
them?

I would be grateful for any clue you might give me.