UPDATE: Garmin has updated their policy with their nuMaps guarantee, which gives users
60 90 days to register their device. Follow the link for more details.
It appears that TomTom and Garmin have both adopted a formal policy of allowing free map upgrades within 30 days of registering a unit. Wait 31 days and you no longer qualify. Hence, I am recommending that anyone purchasing an auto GPS register their device immediately to see if they qualify for a free upgrade.
Your device may have the latest maps, or it may have been sitting on
the shelf for sometime before it sold, during which a map update
was released. So do yourself a favor and register your unit right away.