Good morning ladies and gents, we have the Zumo 660, it is preloaded with the USA maps. We have been traveling through Mexico just using OSM which works well, not too far away and we will be heading into Central then South America. My question is I want to remove the maps we have finished with out of the GPS so we can keep a reasonable speed in the GPS rather clogging it up however I am not sure which ones to leave and take out. I have searched and studied but none the wiser hence my post, any techperts that can pint me in the right direction so I don't end up with a blank screen. Cheers all. Andi.