[Khenai]

Ya por curiosidad, te pones a buscar con Google y algo va saliendo:

STW: Speed Trough Water (corredera)

SOG: Speed Over Ground (velocidad de GPS)

XTE (Cross Track Error) Alarm – this alarm is triggered if you deviate too far from the route.

HDG – Heading. Compass direction into which the bow of a vessel is pointing. NUP debe ser "norte arriba" (?)