Have found for the most part the OnStar navigation system will get you where you want to go, but not necessarily by the shortest route. Can the instructions be tailored to more than one route....ie shortest vs fastest, or some such thing ? Thx Zork
Buy a Garmin or Tom Tom for that sort of selection. You also have a visual too, plus lots more information along the way. Portable if you have a multi-car family or use rentals. Cheaper also
They tend to produce the same routing that you'd get from something like Mapquest or Google. Keep people on major thoroughfares, commonly traveled paths etc. Neat shortcuts that the 'locals' use aren't in the database but they won't dump you on a one-way street going the wrong way.
GPS accuracy has been damn good. Usually within
75 feet. OnStar folk identify vehicle location to nearest street/intersection so actual accuracy in the vehicle's electronics is probably better. I'd chalk that up to better antenna coverage than you get in a portable.Big plus with OnStar Nav over something like Garmin or Tom-Tom is current road-closure info. Easier than screwing with a cell-phone to CalTrans or Nevada's Highway Dept. They only missed once in perhaps a dozen road closure checks and that did cost me a 'double-back' for several miles.
Wasn't using it often enough to make it a great value and reverted to paper maps and the phone.
-- pj
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