How to uninstall maps/Which maps can be deleted?

Dear all,

does anyone know which file is which map and if I can delete them (e.g. I do not need maps for pacific region and if I need them once I would like to reinstall it):

D3231020A.img 3,65GB
gmapprom.img 3,6GB
gmapcycle.img. 3,21GB (should be the Garmin Cycle Map)
gmapprom1.img 2,47GB
gmapbmap.img 51MB
gmapsup1.img 28,7MB
gmapsup2.img. 14,1MB
gmapsup3.img 13,5MB
gmaptz.img. 603KB

I already bought and installed Alpenvereinskarten V3 Map, so these will be also in the list (I think)

Would be great if someone can help me out.