The gmaptz.img is the Time Zone map (contains data for time zones across the globe, including Day Light Saving details). That file should automatically get updated to the latest version when using WebUpdater or Garmin Express.
The nüvi 1340 uses the NT version of the European map, not the NTU (Unicode) version!
Therefore see here: [Only registered and activated users can see links. ]
For details on how to update the maps, see here: [Only registered and activated users can see links. ] (as mentioned by catymag in post #3).
Edit:
gmapbmap.img is the world base map. No need to update.
gmapprom.img is the routable detail map, presumably the European map you're trying to update.



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