A number of customers with Tomtom sat-navs have been told that their devices will no longer receive Map Updates.
"It has become clear that some of our older generation navigation devices do not have sufficient resources to run the newest maps and software."
A spokesman for TomTom told the BBC the company had been "proactively" communicating with customers.
"A full list of those affected devices is available on our website," he said.
TomTom has said active subscriptions to map updates will continue until subscriptions run out, but customers will not be able to renew maps or receive new software updates.