Telegram From Winch Syncro 2020 - Simrad ITI TRAWL SYSTEM - SERIAL DATA COMMUNICATION REV A Instruction Manual

$--HDT,x.x,T*hh<cr><lf> Heading, True
x.x,T is the heading in degrees relative to true north.
$--HDG,x.x,,,,*hh<cr><lf> Heading, Deviation & Variation
$WMSYN,xxx.x,c,xxx.x,c,xxx.x,c,xx.x,T,xx.x,T,xx.x,T*hh<cr><lf>
Note
857-164777 / A
x.x this is the magnetic sensor heading, in degrees.

Telegram from Winch Syncro 2020

This telegram carries the length of trawl wires as measured at the
winches.
Though the sentence is not an approved NMEA 0183 sentence, its
format complies with most of the "NMEA rules".
The ITI will not present the mid wire tension and mid wire length
References:
National Marine Electronic Association NMEA0183.
Standard for interfacing marine electronic devices.
Version 2.20, January 1, 1997.
Port Wire Tension [tons]
Mid Wire Tension [tons]
Starboard Wire Tension
[tons]
m - meter, F - Fathom, f - feet
Port Wire Length
Mid Wire Length
Starboard Wire Length
Sentence identifier
Instruction manual
25