External GPS antenna's

[MTM]

More people that know way better than me on here. But the unit uses them both to show you on your map the exact position of your boat in relation to the screen. As in when your boat turns just a slight amount your map screen turns also. This shows up while sitting spot locked. Otherwise with one antenna your boat has to be moving some for it to show up. Im certain if i am wrong someone will correct me. But fishing offshore I would not be without the external antenna. Makes a big difference. .

[191 champ]

More people that know way better than me on here. But the unit uses them both to show you on your map the exact position of your boat in relation to the screen. As in when your boat turns just a slight amount your map screen turns also. This shows up while sitting spot locked. Otherwise with one antenna your boat has to be moving some for it to show up. Im certain if i am wrong someone will correct me. But fishing offshore I would not be without the external antenna. Makes a big difference. .

Okay, I can totally understand that. I recall being in an extremely dense fog about 200 yards from the dock but had a narrow channel to follow to get to the dock (upper Chesapeake Bay). I had to move to get a heading but the channel was maybe 30 feet wide. Having a real time direction of the boat would have been very useful.

Thanks