The only way to do that is to "not split a large img file" ....
Instead, download the Unlocked Mapsource files (sometimes refered to as the "Gmap" dir) and use those. They are the correct mapsource input files and will always work.
The only reason to split an IMG is if there are no Mapsource input files available and the original IMG is to large to fit on an external SD / MicroSD.
Once you split it with the gmamap tool info is lost and the searches will not work correctly.
UPDATE... I was not aware of the solution Catymag suggested with Basecamp & Mapinstall. Interesting.
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