RE: GPS Internal or External Antenae?
Obviously an antenna with a clear view to the sky would work better than one that is under the metal work of a T-top. They both would work but when you are trying to find something underwater, you want the best accuracy you can get. I would say if your GPS can support an external antenna, put it on the boat!
That's just my opinion and I have not used one with an internal antenna under a T-top so I could be wrong...
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