August 2020 – TD 316 OPERATING MANUAL – Motus Wave Sensor 5729
Page 101
7.3
Input format for external compass
$HC
HDG
Summary
NMEA 0183 standard Heading, Deviation and Variation.
Syntax
$HCHDG,<1>,<2>,<3>,<4>,<5>*hh<CR><LF>
Fields
<1> Magnetic sensor heading, degrees, to the nearest 0.1 degree.
<2> Magnetic deviation, degrees east or west, to the nearest 0.1 degree.
<3> E if field <2> is degrees East
W if field <2> is degrees West
<4> Magnetic variation, degrees east or west, to the nearest 0.1 degree.
<5> E if field <4> is degrees East
W if field <4> is degrees West
$HC
HDT
Summary
NMEA 0183 standard Heading relative to True North
Syntax
$HCHDT,<1>,<2>*hh<CR><LF>
Fields
<1> Heading relative to True North
<2> T = True
$HC
HDM
Summary
NMEA 0183 standard Heading in degrees Magnetic derived from the true heading calculated
$HCHDM
,<1>,<2>*hh<CR><LF>
Fields
<1> Current Heading in degrees
<2> M = Magnetic heading
