If first map is named gmapprom.img second should be gmapsupp.img, and
If first map is named gmapsupp.img second should be gmapsup2.img
*.unl files should be named as *.img files - gmapprom.unl, gmapsupp.unl or gmapsup2.unl
Other way is to transfer from Mapsource one map containing both, USA and Mexico.
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