Merge many raster maps into one OruksMaps

[GBole]

Friends, I'm not good with foreign languages but I hope you understand the google translator.
So, how do I merge raster maps and make one OruxMaps file?
What software to use?
I can see that, but I don't understand how they did it. With Map Merge Utility for OziExplorer I can't create a large enough map.
Thanks a lot. 

[Zaidín]

You may consider using MOBAC. It is the perfect complementary tool for Orux.