NMEA DPT datagram format

The NMEA DPT datagram provides the water depth relative to the transducer, and the offset of the measuring transducer.

Format

$--DPT,x.x,y.y,z.z*hh<CR><LF>

Description

This description is not complete. For additional details, refer to the NMEA standard.

$—: Talker identifier

DPT: Datagram identifier

x.x: Depth (Metres) Relative to the transducer

y.y: Offset (Metres), Relative to the transducer

•

Positive offset numbers provide the distance from the transducer to the water line.

•

Negative offset numbers provide the distance from the transducer to the part of the keel of interest.

z.z: Maximum range scale in use

*hh: Checksum

Tip

If you need the depth below the keel, use the NMEA DBK datagram. If you need the depth below the surface, use the NMEA DBS datagram. If you need the depth below the transducer, use the NMEA DBT datagram.