just wanted to add...got this BMW / GoogleMaps thing working today myself. very cool. how sad that things like this impress
for those that ain't figured it out yet, when your application is processed you will receive an SMS message with a username/password in. this is the username you enter into GoogleMaps. the username seems to default to the mobile number you supply on the application form.
if you want a new username simply login using the original one on:
in there you need to go to the "My Data" section to activate the google maps "send" authorisation. you can then change your username / password to something you prefer and use your new username in google maps.
just tried it out and worked first time for me