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Making maps from OpenStreetMap for Garmin devices

The mkgmap program takes OpenStreetMap data and generates a map in the Garmin .img file format so that it can be loaded onto compatible GPS units.

If you are not already familiar with Open Street Map (OSM) then you why not head over to the OSM website and maybe get involved. The idea is create a map of the whole world.

Features

  • Generates a map directly from a file saved from JOSM or from an extract of the main OSM planet file.
  • Converts several .osm files in one run of the program to create a map tile set.
  • Creates a .tdb file and an overview map that can be used to view the maps in MapSource or QLandkarte.
  • Creates a gmapsupp.img file that can be copied directly to an SD card.
  • Can also combine previously produced .img files into one gmapsupp.img file.
  • Create a .tdb and overview map from previously produced .img files.
  • The mapping between OSM features features in the Garmin map can be customised.
  • Transliteration of characters to ascii where that is possible to enable viewing on low end devices or for international maps.
  • Character set can be specified for display on capable GPS devices.
  • Control over the zoom levels that any feature appears at.

The program does not send the created maps to the GPS unit. This can be done with another program such as sendmap or qlandkarte gt. If your GPS device has a removable SD card, then you can just create a gmapsupp.img file and copy it to the card's /Garmin directory.

Latest commits

  • mkgmap-r4922 improve AngleChecker to fix wrong or missing routing hints where roads are spltting or crossing at sharp angles..
    31 aug 2024
  • mkgmap-r4921 fix split() so that there are no gaps between the 4 children.
    10 jun 2024
  • mkgmap-r4920 update file sizes in unit tests, no functional change.
    10 jun 2024
  • splitter-r654 - add note that splitter doesn't handle holes in *.poly files.
    05 apr 2024
  • mkgmap-r4919 Avoid possible integer overflow in blocksize calculation when gmapsupp contains large number of tiles.
    04 apr 2024
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