I have an account with TomTom but have now got a car with an in-built navigation system and am therefore no longer using my GO5000. I have given the device away to my neighbour and would like her to have the benefits of TomTom support. Since the serial number of the device is registered with me, how do I get TomTom to recognise the new "owner"? Is there a way of cancelling my membership and my neighbour joining with the same serial number? Thanks.