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My Rhino 530hcx won't stay on the map I have on the memory card.  Seems to go to the map on the unit.  If I take the battery off, put back on and restart it will find the map.  Am I doing something wrong?  Was on a ski trail yesterday and the map I wanted showed up just fine.  Even with out turning off the unit I checked it and my topo map was gone and didn't even show up if I went back into settings to find the map.
Also can you put more than one map on the same memory card?
Hopefully I am making my problem clear and thanks for any help in advance.
Elliot

New here and trying out different maps on both Mac and PC to see which I prefer.  Downloaded Mac versions from this site and loaded on my Rino 530 HCx.  Worked just fine.  Then I went to the PC and tried to install maps from Garmin Topo USA 2008.  Tried to connect the rino direct but the memory card could not be found.  Then took the card out and installed map via card reader.  Now the Rino doesn't find the memory card.
Do you have to use only one platform or can you go back and forth.  How do I get the Rino to find the card again.  Do I have to reset the unit and format the card?
Thanks