I've read that heading data makes for better sidescans and have made my own heading sensor (Along with external Neo8M GPS, an AIS receiver and barometric pressure, temperature and humidity sensor) using a Raspberry Pi 3 running Open Plotter. What I need to know is which heading sentence or sentences I need. HDM is the default but I can also generate HDT and HDG with a little effort if I need to. I'm feeding this into the NMEA 0183 port on a Lowrance Elite 7 just for the record and that's what generates my logs. I started do sidescans lifting my outboard and using my Minn Kota Power Drive with iPilot which gives me much better scans on my small boat since the outboard interfered with the left sidescan but I'd like to take it to the next level

My boat is getting way too High Tech for a 16 ft modified V jon boat .......