Unfortunately, this is communicated neither TomTom nor from any other somewhere and you have to consciously that you have to expect significant additional costs if you buy this Navi, since the live service is only for 1 year and not for 2 years as with the "normal" 1015 Navis!
Original response TomTom to my request (note the German):
"You write that you received from us an email with the map update service offer.
Unfortunately, that was a Mass Information.
For your device - Go Camper & Caravan unfortunately there is no map update service for sale ".
... If I had known that before ...