I have a TomTom One XL (WE) sat nav system which guided me across France, Belgium and Holland wonderfully. For the last few weeks however, it was unable to get a signal most of the time when I would go on a long journey so TomTom suggested a hard reset, updating of software etc. but this was all to no avail.
Last night I realised that the inability to get a signal was due to my FM transmitter for my MP3 player (I listen to a lot of audio books when on the road). Whenever the transmitter was on, the signal could not be found or alternatively if the sat nav was on first, the signal would then be lost.
Does this make any sense and if so, what can I do other than forget about the transmitter?
The front windscreen has a heater element which is wonderful in the cold weather but hasn't caused any problems thus far.
I will try a more expensive FM transmitter which I can purchase in Halfords with the proviso that I can return if it is causing any problems. I have tried the one I have plugged into the power socket / cigarette lighter that is in the rear of the car and it still causes a problem.
I suppose I can always go back to using the audio books via CD which is what I did till recently.
Anyway, I'll leave this open till muddypaws gets back with a response and I will update with anything I discover in the meantime.