I have a very basic GPS and looking to add a map for Europe since I am going on vacation, I have found a map on the Internet, I have copied the gmapsupp.img on a SD card. But eh GPS doesn't see the new maps ??? Please help me ...
Create a folder named Garmin at the root directory of the card, then move the gmapsupp.img file there. This tutorial shows how to select the map on your GPS: http://www.gpsfiledepot.com/tutorials/how-to-change-which-map-is-displayed-on-a-garmin-gps/#nuvi
To see the map, you will probably have to disable the City Navigator map and turn on the GPS simulator in the Nuvi system settings. Then zoom way out, drag the map to Europe and zoom back in.