Correction to my reply, I was tired. The coax from the GPS goes into the vehicle communications interface module (OnStar) and from the VCIM module it goes to the radio, as a deciphered signal.
HummerTech...
All the H3s have a GPS antenna, it is part of the Onstar/XM antenna on the top of the vehicle (called the shark fin). Onstar requires GPS to locate your vehicle in case of an accident. However, you are correct for the Nav unit GPS antenna being mounted under the dash.
One last thing, I checked the online GM parts system today, and under the radio information, the NAV unit has NO part number and in the description it is flagged. Therefore, a dealer cannot order one for an H3.
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Black Sheep Hummer Squadron
(ME TOO)
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