Join Date: Jul 2005
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It depends on which model of TomTom you've bought.
If you've bought the Classic GO (second-hand), the 300, 500 or 700, then you'll need to either buy an external antenna, or position the unit right next to the rear view mirror so that it can 'see' the sky through the dotted area. My 700 works quite well there, but it does mean that you can't use your sun visor.
If you got the TT One, 510, 710 or 910, then the coated windscreen shouldn't be a problem.
Whatever you do, don't buy the permanent docking kit. It's an absolute heap of junk and I don't know how TT have the nerve to sell it. If you do insist on buying the docking kit, then I did an article on the trials and tribulations of installing it in my Phase 2. The Phase 1 install was a bit easier and the standard power connections actually worked
Currently in Horatio's garage:
2010 Laguna III Initiale.