What is this device? It is not a GPS sensor. I am sure it is something simple.

Could be a bumper. What is the stainless thingie in front of it? Boat model please.
 
Can you get underneath it from inside the boat? Any wires? SIRUS antenna is a good call. My antenna isn't mounted and it's sensitive about having a good sky view. Put foil or a frying pan over it and see if your SIRIUS radio still works.
 
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Thinking Sirius also. Older style. The antenna to the right of my all-around light is the newer style.
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