Pungente, my nüvi 205, for example, does not recognize 3 maps installed in the garmin paste from sd, and i believe that other people can have a similar problem. In this case, the way to use 3 maps is install the pack.
As long as you have an updated firmware, there´s no need to use this pack. You can have 3 maps in your Nuvi 205 putting 1 map in internal memory naming it gmapprom.img, and the other 2 in SD under folder Garmin naming them gmapsup1.img and gmapsupp.img.
Bookmarks