You must be sure about the path where you store the map. Look in your "[etrex 30]":\Garmin\GarminDevice.xml" and the "NMaps" property. I'm not acquainted with etrex 30 and the map paths for that unit.
Some units have "NMaps" as "Map" and other as "Garmin". If you store the maps as something like "HXUS030R.img" & "HUS031R.img" then they must be in the "NMaps" path. If you instead store the maps as a supplemental maps then you should name the map as "gmapsupp.img" (possibly "gmapsup1.img or "gmapsup2.img" for the second map) and store that in "[etrex 30 or microSD]:\{SupplementalMaps directory}\gmapsupp.img".
For troubleshooting - All the maps that Garmin sells as microSD/SD card products are stored as "[Memory card]:\Garmin\gmapsupp.img". That generic path should work on all Garmin units with a memory card slot but those products are with just one map ("gmapsupp.img").
Newer nüvi models - GarminDevice.xml:
Code:
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Montana 650 - GarminDevice.xml:
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