Try this:

java -jar mkgmap.jar --gmapsupp otm-hungary.img otm-slovenia.img

El 13/7/23 a las 16:35, Tamas Gal escribió:
Hi all,

maybe I got that wrong but I thought I can merge multiple IMG files into a 
single one with Mkgmap. My problem is that I need a bunch of maps and my Garmin 
64s only shows 12 in the map selection. A simple solution to this limitation is 
merging maps ;)

Anyways, I gave Mkgmap a try but I get an error which I don't know how to 
interpret, since it's missing the input files but they are definitely in the 
folder. Do I maybe need the original OSM files as input files? In that case, 
the error message is probably wrong.

Here is an example where I try to merge the Hungarian and German map into a 
single IMG:

░ tamasgal@silentbox:~/opt/mkgmap-r4909
░ 16:29:24 > ls -alh *.img
-rw-r--r--@ 1 tamasgal  staff   126M Jul 13 16:24 otm-germany-contours.img
-rw-r--r--@ 1 tamasgal  staff    43M Jul 13 16:28 otm-hungary-contours.img
-rw-r--r--@ 1 tamasgal  staff   346M Jul 13 16:28 otm-hungary.img
-rw-r--r--@ 1 tamasgal  staff   246M Jul 13 16:29 otm-slovenia.img

░ tamasgal@silentbox:~/opt/mkgmap-r4909
░ 16:29:32 > java -jar mkgmap.jar --input-file otm-hungary.img --input-file 
otm-slovenia.img --gmapsupp
Mkgmap version 4909
Time started: Thu Jul 13 16:29:45 CEST 2023
SEVERE (Main): : input file '' doesn't exist
WARNING (global): Setting max-jobs to 1
SEVERE (Main): : input file '' doesn't exist
Number of MapFailedExceptions: 0
WARNING (global): To reduce the run time, consider increasing the amnount of 
memory available for use by mkgmap by using the Java -Xmx flag to set the 
memory to more than 32800 MB, providing this is less than the amount of 
physical memory installed.
SEVERE (global): Exiting - if you want to carry on regardless, use the 
--keep-going option
Number of ExitExceptions: 1
Time finished: Thu Jul 13 16:29:45 CEST 2023
Total time taken: 182 ms

Any ideas?

Thanks in advance,
Tom
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