Garmin .img

The Garmin .img format is what Garmin devices use to store the maps for its GPS units. The img files contain a header and many subfiles. Img's filestore is based on FAT system.[1] Some old GPS units are not able to work with multiple img files so they need to be merged into one file called gmapsupp.img using programs like Mapsource.[2]

The IMG file contains the needed information for rendering a map on a Garmin GPS unit, and may support autorouting information for those GPS units that offer navigation (i.e. in-car GPS routers and some types of devices intended for hikers).[2]

The .img file is basically a hard-disk image (complete with partition table) containing a filesystem which itself contains subfiles that provide the functionality for the Garmin GPS unit. The filesystem seems to be "flat": that is, it doesn't directly support the concept of subdirectories, however the .GMP subfiles do provide a kind-of subdirectory structure.[2]

Programs that read .img format

  • Mapsource
  • GPSMapEdit

Programs that write .img format

  • CGSPMapper
  • Mapwel

Open Source Tools for .img Format

Garmin IMG Format This program is designed to aid in the decoding of Garmin IMG files. It hexdumps the IMG file side-by-side with plain-text descriptions of what the particular bytes in the file represent.[3]

References
  1. "OpenStreetMap wiki". IMG File Format.
  2. "OpenStreetMap wiki". OSM Map On Garmin.
  3. "Garmin IMG Format SourceForge Project".
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