Simrad SH80 - REV C, Installation Manual

Page: 155 / 200

Technical specifications
139
851--164300 / C
Gyro
The sonar can receive the following gyro telegrams.
•
Heading, magnetic
•
Heading, true
Heading, magnetic
$??HDM,x.x,M,,<cr><lf>
where (from left towards right):
Component Content
?? Talker
HDM identifier code for the type of system used
x.x heading in degrees magnetic
Heading, true
$??HDT,x.x,M,,<cr><lf>
where (from left towards right):
Component Content
?? Talker
HDT True heading
x.x heading in degrees relative to true north