The information on the City Navigator NT however, remains on the sd card. Remove the card from the 695 and you no longer have access to the NT info. Pop the card back into the 695 and your good to go again
This is also the case for the Garmin Topo data. SD card must be in the GPS. It can be the same card that you use for updating providing the card capacity is sufficient. A 4 GB card shoulld be adequate for even the worst case(for Topo data); not sure about City Navigator.