I would first talk to the maker of whatever software you are using on the PC to see what data sentence they support and what ports will it use. Do they accept via USB or must it be normal serial connection?
GP1870F and put out depth and temp infomation by 0183 and NMEA 2000. The full spec sheet (Pg S-2) in the operator's manual lists all the possible sentences offered. https://www.furunousa.com/-/media/sites ... _ver_f.pdf