Takes 15 mins for TT to pick up a signal in a certain car.

[RoShamBo]

As title really - in my wifes Zafira my TT 910 takes almost exactly 15 mins to lock onto a signal, then it kicks into life. On any other car its much much quicker (almost instant)
Type of windscreen ? Just odd that you can almost set your watch by it - but it is a real pain if you are somewhere you dont know you want it to work straight away !

[ehyouwhat]

If it's of any consolation, my TT can't get a lock at all in our 207cc. It's been suggested that this is because the athermic windscreen stops the signal getting through, although I don't know whether that's true or not.

[kxaddict]

Sometimes there can be an issue if the windscreen is heat reflective

Tomtom sell an external aerial through there website which should sort it out.

[RoShamBo]

Cheers - might invest in one.

[audidoody]

ehyouwhat said:

If it's of any consolation, my TT can't get a lock at all in our 207cc. It's been suggested that this is because the athermic windscreen stops the signal getting through, although I don't know whether that's true or not.

Yup - Frog car. Happens in Renaults as well. It's the windscreen. Had it happen to me with a hire Pug. I slung the TomTom on the side window and just used the voice instructions!

[IAmNotTheStig]

Totally agree - You've either got a UV reflective windshield (will have a slight blue tint) or one with heated one (will have regular vertical lines that are very thin and faint, but can be seen against a white background.
A few people are talking about the TomTom 910 sat nav on review websites saying the same thing.

[GC8]

Athermic windscreens usually have a clear/unprotected part immediately over the rear view mirrir, so thats the best place to locate an auxiliary aerial.