I have just accidentally discovered that it is possible to have multiple gmapsupp.img files on my Garmin Oregon 300. Since I have not seen this method mentioned anywhere else here it is.
Problem: I regularly update my local OSM data (since I am in Australia from http://www.osmaustralia.org/garmin.php) but I also have other maps, notably topographic, on the Garmin uit that I don't change. If I upload the combined gmapsupp.img using MapSource it takes forever. What would be nice would be to only upload the tiles that have changed but the conventional advice is that there can only be one gmapsupp.img file per drive i.e. one in the base unit and one on the micro SD card. Method: 1. Upload to Garmin unit the unchanging maps. This creates (or overwrites) a file called gmapsupp.img. 2. Disconnect the Garmin unit, switch on, then open and check the map uploaded. 3. Reconnect the Garmin unit to your computer and locate the gmapsupp.img just created. 4. Change the file name to anything else e.g. gmapsupp-topo.img. 5. Disconnect the unit and switch on again. The original maps will still be there. 6. Reconnect and upload a new set of maps. This will create a new gmapsupp.img file but not overwrite the first lot of maps. 7. Repeat the steps above, changing the file name each time. 8. To overwrite data, change the name of the file back to gmapsupp.img and upload new maps. (No sure if the file can't just be deleted but I have been getting the "The map set is approximately nnMB, but only nnnMB is available in the destination. Please select fewer maps and try again." message from MapSource.) There seems to be no limit to the number of files that can be handled in this way. I have 16 at present making it very quick to add or update existing data. _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
