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There is a floating ball, not a digital readout. I called Garmin and they told me the GPS unit should not affect it. They said place the unit next to the compass and see if the compass moves, than they say also place the unit next to the compass and power it on at same time to see what happens...

Hey guys thanks for your help. I guess I will just get in touch with Garmin and make sure that there GPS/Fishfinder does not have any Magnetic field in them. To be honest I don't know what kind of compass I have at the moment, (boat a couple hours away) all I know is it has a small black wire...

I am installing a new Garmin 520S GPS/Fishfinder on my 1985 Overnighter, and plan to place the GPS screen a couple of inches to the left of the electric compass ball that is currently mounted there. Can anyone tell me if this will cause any problems? Either for the GPS or Compass. I just...

After Looking at all my options I decided to go the newer system by getting the "Add a Battery Dual Circuit System" from Blue Sytems. It seems to be the best and most effective way for adding the two batteries eliminating the charging and balancing problem between the two batteries that could...

First I like to say again guys thanks for all your help. However I think Curmudgeon has more of the idea what I was talking about. I did not want to use both batteries at same time for more power ( which I assume would be a parallel configuration) . Do the fact gas is prob going to be like 9...

Hey guys thanks for the info. So what your saying is it's better not to use a deep cycle battery for my stereo and my GPS? I just purchased a new Starter battery for my boat a couple days ago. The old one was dead and 3 yrs old. This new one was on sale at West marine for $50. It has Marine...

I just purchased a 1985 overnighter with single 200hp Mariner Engine. It currently has just one starter battery. I want to add a second deep cycle battery to connect a stereo and my Garmin Gps when the boat is not running. I know I need a (1, 2, both and off switch) connector for connecting both...