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Hat tip to my brother Alex for passing on these tips from the Director of the Vermont Association of Travel Professionals:

Due to the large number of manufacturers of GPS, and the fact that users do not always update their maps, correcting or adding information can be a difficult task. However, to begin to properly update an address on a variety of GPS mapping products, here is a list of the major GPS providers and links to their update pages:

Tele Atlas provides the source data to companies such as Google, TomTom, and several automobile manufacturers. You can provide feedback on their maps at: http://mapinsight.teleatlas.com/mapfeedback/index.php

NAVTEQ is similar to Tele Atlas and map feedback can be reported at: http://mapreporter.navteq.com/

Garmin manufactures GPS devices and map errors can be reported at: http://www8.garmin.com/cartography/mapSource/errorForm.jsp

Rand McNally offers online mapping and print mapping options. To report map errors go to http://www.randmcnally.com/rmc/company/cmpContactUs.jsp?cmty=0
(Click on “Feedback about online maps, driving directions, and trip planning”)

Google Maps provides online maps and directions. Errors can be reported at: http://www.google.com/local/add

MapQuest also provides online maps and directions. Errors can be reported at: http://help.mapquest.com/jive/mqdataerror.jspa