The NMEA DBK datagram contains depth below the keel in feet, meters and fathoms.The datagram is no longer recommended for use in new designs.It is frequently replaced by the NMEA DPT datagram format.
Format
$--DBK,x.x,f,y.y,M,z.z,F*hh
Description
All depths are measured from below the keel.
1
$—: Talker identifier
2
DBK: Datagram identifier
3
x.x,f: Depth (Feet)
4
y.y,M: Depth (Metres)
5
z.z,F: Depth (Fathoms)
6
*hh: Checksum
Tip
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.