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  1. #1
    Junior Member
    Join Date
    May 2016
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    Default 3D Map Garmin Nuvi 3790

    Newbie question: When I update my 3790 map to the 2017.1 version do I update the 3D as well as the DEM map?


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  3. #2
    Global Moderator

    smokefree's Avatar
    Join Date
    Sep 2010
    @ home
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    DEM = Digital Elevation Model. It shows ground contours when zooming out sufficiently.
    3D = 3D buildings and landmarks. It shows when zooming in sufficiently.
    With each new map, there will be a new gmap3d.img file.
    Not with each new map, there will be a new DEM file. Ground contours don't change that often, provided no major land slides have taken place.

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