The following is from TOMTOM ,as stated on original post it works on the UK map
The reference number for your query is 100928-001946.
Thank you for taking the time to contact TomTom Customer Support. My name is Stacy and we are always happy to help.
TomTom FM transmitter is used to get the traffic update on your device. To understand the concept of FM transmitter, please go through the below mentioned link.
Link:
[Please Register or Login to download file] To play TomTom
voice navigation device on your car radio, please check the below details:
1) Find an FM radio station on your car radio that has nothing but static (i.e. maybe 102.3 FM)
2) Tune your radio to the 102.3 frequency
3) On your TomTom GO:
a) Select the CHANGE PREFERENCES icon
b) Then select SPEAKER PREFERENCES
c) Then select the speaker you want your GO to use for announcing instructions (if you want the instructions to come over your car radio, select FM TO YOUR CAR RADIO)
d) Then select the speaker you want your GO to use for playing music (if you want your MP3s to play over your car radio, select FM TO YOUR CAR RADIO)
e) On the next screen, click on CHANGE
f)Input the exact same digital frequency from Step 1 above)
g)Click OK
h)Then Click DONE
If any further query, please feel free to contact us.
With Kind Regards,
Stacy S.
The TomTom Customer Care Team
Should you wish to reply to this e-mail, please go to the TomTom website and log in. Once logged in, click on the support button at the top of the website, and then under support links on the right hand side you will see the link to My Questions. Click on the subject heading to view and update your question, you will also find the option to attach files here and to download any that the TomTom Customer Care team may have sent you.