[OSM-newbies] Multiple gmapsupp.img files on Garmin

[swanilli]

Hi Bill

It seems that it does have to be uploaded as gmapsupp.img first.

When I start my Oregon 300, a "Loading maps" (or some such) message
appears at the bottom of the screen. My guess is that it must be
locating the maps in memory rather than in their files, hence the name
change does not cause them to be lost.

I have tried copying the files (not named gmapsupp.img) but they seem
to be ignored – they are only recognised if named gmapsupp.img at
least once.


2009/8/22 Bill Ricker <bill.n1vux at gmail.com>:
> 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 <swanilli at 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.
>>
>> _______________________________________________
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>
>
>
> --
> Bill
> n1vux at arrl.net bill.n1vux at gmail.com
>
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