I wouldn't pay for the free updated maps if it is more than a few bucks. A Garmin Nuvi can usually be had for 50$ if you watch for a sale. Unless you are in a brand new community it should be good for years. In five years it is far more likely that you will have a phone with data and the free live updates. Five years ago very few people had them and now almost everyone does, in five more years it will provably be a given. Either way I can't see the GPS still working and useful in five years.
As a side note with the fixes to Glonass and Galieleo and Beidou being launched over the next few years your GPS will be a poor second cousin to the new GNSS systems and you will most likely upgrade anyway.
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