I can always tell when it is time for an update on my navigation system. The on-board navigation systems don't update themselves automatically.  You have to purchase the updates. Some updates are specific to an areas of the country.  My on-board navigation from last year already has problems when I leave the normal city grids.  I expect that new subdivisions are not going to be included but I also expect rural roads that have been there for a 100 years to be there. I have been in some areas where two tracks and old logging trails have been included on my maps then again I have had some blank screens when I thought it would be included. I gave away my portable GPS to my sister a year ago.  Now Tom-Tom navigation, Garmin and Magellan compete for this market. Many agents that I know use To... 05/09/2009