There's a new software version (not a new map) available for many Garmin Units. I own three -- a NAV V, a Montana, and a Nuvi 2539 -- and the update was there for all three of my units. NAV V software version was updated to 3.50. Looks like it was a minor update to the time zone maps. It loaded in less than 1 minute (ethernet connection) and slightly longer -- maybe a minute and a half -- via WiFi.
Enjoy!
Enjoy!