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After many hours of experimentation using 2 sandisk micro sd cards (8gb and a 16gb) I have found my astro 320 will only recognize the last map added to the  sd card. I can add one state topo map or 3 state topo maps per card and the only one that shows up on the map list  except for the permanent world wide dem map. I cannot add a state topo and a transparent trail map for example since the only map that shows up is the last one added to the sd card. It is not a big deal as I can just have a bunch of cheap sd cards with the maps I want, but after 6 hrs I would like to know why the gps cannot recognize more than one map. I dont think it is exceeding the 4 gb limit I saw concerning Nuvis. Any ideas??? thanks