I've read lots of threads on maps for Central America and have still not found anything that will fill my needs for detailed maps of El Salvador and Guatemala but can deal with what's available I think. I will be working in El Salvador for the next year and will probably take my GS down after Christmas but will take my Nuvi 550 down as a navigation aid while traveling mostly by truck. The one I have came with North America Cities as the base map and I purchased World Map to use as a base map in El Salvador. If anyone has other suggestions for additional maps, please let me know. Questions: Is World Map the same base map that is in my 76S? Also, when I went to load World Map it required that I select a map. Is there any way to just load the entire world map? I could not figure out how do select all so I just mostly selected the western hemisphere but since I do work in other hemispheres at times it might be handy to have on the Nuvi. Thanks in advance for any advice and if you're heading Central America way after Christmas, let me know.