322
406388/F
4
z.z,a
: Deviation (Degrees Magnetic), East/West
• E = East
• W = West
5
r.r,a
Variation (Degrees Magnetic), East/West
• E = East
• W = West
6
*hh
: Checksum
NMEA HDM datagram format
The NMEA HDM datagram provides vessel heading in degrees magnetic. The datagram
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
HDM
: Datagram identifier
3
x.x,M
: Heading (Degrees Magnetic
4
*hh
: Checksum
NMEA HDT datagram format
The NMEA HDT datagram provides the true vessel heading. The information is
normally provided by a course gyro.
Format
$--HDT,x.x,T*hh<CR><LF>
Description
1
$—
: Talker identifier
2
HDT
: Datagram identifier
3
x.x,T
: Heading (Degrees True)
4
*hh
: Checksum
Simrad TV80 Reference Manual
Содержание Simrad TV80
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