First you need an updated Garmin City Navigator® NT street maps (Version 9 is the most current) which can be purchase from Garmin for the price of $75 if I recall. The new City Navigator® NT street maps should come with an unlocking code to unlock the maps so you can write the new maps to you Garmin GPS unit using the Mapsource software to either the unit's built-in or external memory. The Wedupdater only updates the streetpilot software not maps. GL.