Even though my 5600 gives me the choice of downloading 5, 10, 20 hours of data, or ALL flights, it looks like it will only download 10 hours, which is 10mB of data. I have selected each of this choices but it still only downloads 10 hours of data. Is that how it's supposed to be? If it only can retain 10 hours of data, why give the choice for 20 hours or ALL?