Originally Posted by Martinini
If you know which wires are the correct ones yes. I did a search on your radio and found that the links to online manuals
had been removed. Seems they want you to have to purchase
a new one from them. Not a good sign.
SoonerSailor beat me to it!
The manual is located at the "Files" tab on the GX1000S product page
I'm not sure what Paul and Martinini are referring to with respect to the RCA jack. RCA-style jacks are usually for analog audio or composite video signals and for digital audio - not for NMEA connections. In fact, there is no standard NMEA-0183 jack, since the NMEA never bothered to define one as far as I know. They corrected that mistake for NMEA-2000...
Most VHF radios have a pigtail with bare leads for NMEA, hailer, etc...