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post #9 of (permalink) Old 17th April 2006
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The One, and the new 510, 710 and 910 all use the newer and more sensitive SirfStar III chipset. I think the Rider does too, though I couldn't swear to it. The SirfStar III has no problem 'seeing' through coated windscreens, and will apparently often give a perfectly good signal indoors.

In the case of the TomTom units, it's the Classic (original) and the 300, 500 and 700 that will usually need an external antenna when used in a car with a coated windscreen. Though since replacing the Clio for a newer one (with a coated screen) we've found that our 700 works well enough if it can see the sky through the sunroof.
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