VAF instruments Shapoli 620 - Speed over Ground (SOG) Via NMEA 0183; Speed through Water (STW) Via NMEA 0183

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7.3.4 Speed Over Ground (SOG) via NMEA 0183
A GPS signal can be connected to the SDB-3 through the RS422 port (J4).
The ship’s speed over ground is transmitted via the NMEA 0183 protocol. The SDB-3 and Bridge Panel
PC will read out the $--RMC sentence (“Speed Over Ground”) and the value will be displayed in knots.
The ship’s through water is transmitted via the NMEA 0183 protocol. The SDB-3 and Bridge Panel PC
will read out the $--VHW or $--VBW sentence (“Speed Through Water”) and the value will be displayed
in knots.
7.3.5 Speed Through Water (STW) via NMEA 0183
The ship’s through water is transmitted via the NMEA 0183 protocol. The SDB-3 and Bridge Panel PC
will read out the $--VHW or $--VBW sentence (“Speed Through Water”) and the value will be displayed
in knots.