NMEA DBS
The NMEA DBS datagram provides the current depth from the surface. The datagram is no longer recommended for use in new designs. It is frequently replaced by the NMEA DPT datagram format.
NMEA DBT
The NMEA DBT datagram provides the current depth under the transducer. In new designs, this datagram format is frequently used to replace the DBK and DBS formats.
NMEA DPT
The NMEA DPT datagram provides the water depth relative to the transducer, and the offset of the measuring transducer.