Per a message from GM, the NAV system will be available come October/November time frame. I'll probably order before and just continue to use my Garmin iQue 3600 for cross-country, and Magellan SportTopo for off-roading.
Most of these manufacture installed NAV systems offer no topographical information or detailed information about national parks. My Magellan details all the arches, points of interests, etc., in all the US National parks.
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Black Sheep Hummer Squadron
(ME TOO)
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