Hi Felix and Carlos,

sorry, I am a bit lazy here because it's no fun to wait many minutes or hours 
for a result while my machine is barely usable...

My current assumption is this:
You use splitter to split e.g. Europe or Asia or Africa. You either split with 
a given split-file or you let splitter calculate the tiles each time you are 
splitting.
The resulting OSM files are compiled and give a set of tiles, e.g. from 
47110001.img to 47113456.img, all located in the same directory.
You want to compile one or more gmapsupp files for this set. A single gmapsupp 
would be created with e.g.
java -Xmx4G -jar mkgmap.jar --gmapsupp --no-tdbfile --index --description=MyMap 
family-id=4711 [... other options] 4711*.img My.TYP

but that would be too large. Let's assume the size of all the 4711*.img files 
is > 4 G and below 6G my simple approach would be something like this:
set options=--gmapsupp --no-tdbfile --index --description=MyMap family-id=4711 
[... other options]
java -Xmx4G -jar mkgmap.jar %options% 47110*.img 47111*.img My.TYP
ren gmapsupp.img gmapsupp1.img
java -Xmx4G -jar mkgmap.jar %options% 47112*.img 47113*.img My.TYP
ren gmapsupp.img gmapsupp2.img

This creates 2 files containing all the tiles, each probably < 4G.

Does this work? If yes, I have an idea how to change mkgmap.
@Felix: My test with MapInstall produced three files for a selection of ~6G, 
each between 2G and 2.5G.

Gerd



________________________________________
Von: mkgmap-dev <mkgmap-dev-boun...@lists.mkgmap.org.uk> im Auftrag von Gerd 
Petermann <gpetermann_muenc...@hotmail.com>
Gesendet: Mittwoch, 21. Oktober 2020 15:50
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Split gmapsupp.img

Hi Andrej,

great thanks, that seems to work fine.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-boun...@lists.mkgmap.org.uk> im Auftrag von Andrzej 
Popowski <po...@poczta.onet.pl>
Gesendet: Mittwoch, 21. Oktober 2020 15:40
An: mkgmap-dev@lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] Split gmapsupp.img

Hi Gerd,

empty usb drive is treated as a SD card, where only single gmapsupp.img
is supported. Try to copy \Garmin\GarminDevice.xml from a GPS to
pendrive, then MapInstall will treat it as a real GPS.

There is other possibility. Select an empty folder on your HDD, unpack
there files from attached archive and execute vgps-install.bat. This
will create some config for MapInstall, which will use your selected
folder as a destination for maps. You can then remove installation files
from the folder.

--
Best regards,
Andrzej
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