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Success!!  One needs to open the  gmapsupp.img file after loading each map onto the sd card and rename the files. Somehow I was not doing it correctly, but it works great now.  Last question: do I need to disable maps I m not using ie will  it slow down the gps or can I just leave them all on?? Thanks again for all the help.

I did use the .img extension when I renamed the files. I will try again since Newwood said it worked on his/her astro. My firmware was updated. Thanks to all for helping . I will let you know if it works.

I tried this suggestion and added a couple maps to the sd card. I changed each name as suggested and the astro did not recognize any of the maps ie none came up on the map list including the map that worked prior to changing the name. It appears to me: the astro only recognized the file when named garmin... and the file gets written over each time I add a new map??? Does this make sense?

I do not understand how to rename the maps as you describe. Do I change the name on the sd card? When I look at the sd card after loading several maps I only see one garmin file. Sorry I need instructions for a simpleton. thank s

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