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Re: Help someone who should know PLEASE!!
I had to run some tests last year on a couple of vehicles, specifically looking at this problem. Those vehicles were a Ford Mondeo and a Renault Espace. The screens of both vehicles were found to cause a problem.
The Mondeo had a heated screen. The screen of the Espace had a reflective coating, which apparently has a metallic content.
I'd advise a trip to a Sat Nav dealer who'll let you try before you buy. Any decent dealer will have demo units, and it won't take you long to check. That said, it may work fine out in the open, but may well struggle a bit in very built up areas of cities where tall buildings are quite close to each other. A lot of GPS devices we have used can struggle in certain parts of London.
They could always keep a small external antenna in the car for emergency use. We've got some small ones that aren't much bigger than a thumbnail.
Good luck.
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