Function	SeaTalk ID	NMEA	ST -> NM	NM->ST	Display	Internal
Depth	0	DBT	X		X	X
Speed t. Water	20	VHW	X		X	X
Speed t. Water	26	VHW	-	-	-	-
Trip Milage	21	VLW	X			X
Total Milage	22	VLW	X			X
Temperature	23	MTW	X		X	X
Temperature	27	MTW	X	X	X	X
Total / Trip Milage	25	VLW	X	X		X
Wind Angle	10	MWV	X	X	X	X
Wind Speed	11	MWV	X	X	X	X
Compass	84	HDM  (VHW)	X			X
Compass ST40	89	HDM	X		X
Speed over ground	52	RMC	X	X	X	X
Course over ground	53	RMC		X	X	X
Lamp Intensity	30				X	X
Lattitude	51	RMC		X	X	X
Longitude	50	RMC		X	X	X
Special NM->ST	any	$STALK	X	X		X
Configuration	-	$SNBSE				X
ST->NM = Read from SeaTalk bus, send to NMEA Bus
NM->ST = Read from NMEA Bus, send to Seatalk Bus
special $STALK,xx,yy,zz  Sends Command xx with Parameter yy,zz to SeaTalk