I will have to try this with my 76csx Does it have to be loaded as gmapsupp.img and used once before each renaming?
I have been placing extra *.img in named subdirs and copying to Garmin/ to select, but being able to switch without a usb connect would be much better, since states in New England are so small, I can drive across a corner of NH or VT in not much longer than than it took to swap Bill On Fri, Aug 21, 2009 at 10:24 PM, swanilli <swani...@gmail.com> wrote: > 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 > newb...@openstreetmap.org > http://lists.openstreetmap.org/listinfo/newbies > -- Bill n1...@arrl.net bill.n1...@gmail.com
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