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That must be it.  I assume that just disabling a map does not free up the segments it used, right? 

I will try removing everything and adding back one at a time.  Thanks for the help.

I transferred a large number of maps from Basecamp to my Montana 650t.  Many of the maps had corresponding overlays.  For example, Florida topo and Florida wildernesses.

I can see those listed separately in Basecamp, but after I tranfer to my GPSr, I only see Florida wildernesses and not Florida topo in my GPSr map list.  However, if I disable all other maps except this one (Florida wildernesses), it still displays with background.  Is that the way it is supposed to be?  Or is something going wrong?