This is not a real map, just contour lines of all of Germany. The intervall is between 5m and 50m, depending on where in Germany. The "map" is transparent, which means that you can let your GPS show them at the same time as it shows you the "normal" map, e.g. the Metroguide. You can download it as a .zip file which includes three .img files, which you can either integrate manually in Mapsource or send it directly to your Garmin GPS device (check Tips 'n Tools for more instructions).
For those having problems with the cotour lines (especially on newer devices (Colorado, Oregon, Nuvi)) they might want to try this link with a TYP file which should fix that problem.
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