ADM to GPX Wiki
Convert a Garmin ADM database file to a GPX file
Status: Beta
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adaviel
adm2gpx is a Perl script to convert a Garmin ADM 1.1 datafile to standard GPS interchange format XML (GPX). While older Garmin GPSmap devices generate "MapSource" GDB files, understood by e.g. gpsbabel, and Nuvi devices generate GPX directly, newer GPSmap devices generate binary ADM files.