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Description
1
: Talker identifier
$—
2
: Datagram identifier
HDG
3
: Heading (Degrees Magnetic)
x.x
4
: Deviation (Degrees Magnetic), East/West
z.z,a
E = East
W = West
5
Variation (Degrees Magnetic), East/West
r.r,a
E = East
W = West
6
: Checksum
*hh
NMEA HDM datagram
The NMEA HDM datagram provides vessel heading in degrees magnetic. The datagram
format is no longer recommended for use in new designs. It is often replaced by the NMEA
HDG telegram.
Format
$--HDM,x.x,M*hh<CR><LF>
Description
1
: Talker identifier
$—
2
: Datagram identifier
HDM
3
: Heading (Degrees Magnetic
x.x,M
4
: Checksum
*hh
406388/B
Datagram formats
279
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