I have the terrova i pilot link 55lb 12v. I run a helix 7 si g2 at the console. I just purchased 858c HD. I already have the ethernet cable ran for the ipilot link connection to the 858c. I mainly need/wanted this to have access to my waypoints for the go to spot lock function.

The unit i bought is the head unit only. Not a big deal bc I plan to use the built in us2 sonar transducer in the terrova. My issue is that unit 858c HD uses external gps antenna Which i wont have. Will it use the i pilot links gos puck once it is connected? Would love some help if anyone could assist.