Simrad GLL datagram format
Simrad GLL is a proprietary datagram format created by Kongsberg Maritime to provide the current geographical position of the trawl sensor.
Note
The GLL datagram may be received from integrated instruments using the “ii” talker identifier. The Simrad ITI system uses the same talker identifier “ii”, and this has caused some confusion. In order to rectify this, the ITI GLL datagram has been deactivated.
Format
$IIGLLddmm.hh,N,dddmm.hh,W,hhmmss.ss,A<CR><LF>
Description
1 IITalker identifier
2 GLLDatagram identifier
3 ddmm.hh,NLatitude (degrees, minutes and hundredths)
•  N = North
•  S = South
4 ddmm.hh,WLongitude (degrees, minutes and hundredths)
•  W =  West
•  E =  East
5 AStatus