Difference between data SSTLL and TLL

[truonghoangvu]

Hi,everyone
Everyone to explaine how to output NMEA data SSTLL of sonar CH250 to Gp39 only receive TLL data.What is the difference between SSTLL and TLL.
Thank you very much

 

[Melville]

TLL is the sentence for target Latitude and longitude.
SS is the identifier of where the data is coming from. Sounder, scanning.

All NMEA 0183 sentences will have a 2 character identifier.

 

[truonghoangvu]

Thanks! Melville