ruby-mapsource is a library that allows ruby programs to read files created by Garmin's MapSource and BaseCamp.

Usage

gdb = MapSource.read('/path/to/gdb_file.gdb')
# => #<MapSource::Reader:0x007fedfcb1b768>

# Read waypoints
gdb.waypoints.each { |wp|
  puts "#{wp.shortname} - (#{wp.latitude}, #{wp.longitude})"
}

# Read tracks
gdb.tracks.each do |track|
  puts "#{track.name} has #{track.size} points"

  track.waypoints.each { |wp|
     puts "\t#{wp.shortname} - (#{wp.latitude}, #{wp.longitude})"
  }
end

TODO

• read routes
• comprehensive testing of different versions

Thanks

GPSBabel - gdb.c was vital in understanding the format