1- yes you can load different maps at one time- you just select them from the drop down menu of maps in Map Source and select the tiles you want
On the gps , from the map menu you can tick or untick those you do not want- TIP => then turn off gps and turn on again and it will work faster as the non ticked map have not been loaded .
2- testing larger cards - well in the absence of one, I'll 'Duck' out (sorry!) and stay with the 2GB cards - personally speaking, I have a few so it's not an issue for me.
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