Robert,
Don't know when exactly you're going, but instead of buying a gps, I would suggest you form a small convoy with some other travellers (plenty of choice). Knowing that you don't have a 4x4, it is advisable to follow the piste. A guide knows the best tracks and is fairly cheap (about 30 Euro per car in a small convoy).
But ... Make sure you liaise with the french "car smugglers" as they know the good guides. I heard stories (2 years ago) of "bad" guides who take your through difficult pistes where your car has a high chance of breaking down. You'll be forced to leave it behind and sell it for few money. The guide gets a commission from the buyer, who "just happened to be in the area".
Have fun
Gert
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Crazy traveller
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