I currently have maps/data for 12 states.  All of the maps are up to date.  I want to reduce the map count to 4 states.  After selecting "Update" on the 740b tablet.  I get a long list for Sectional Charts, TAC charts, airport photos, airport diagrams.  Some of the states or cities, that I have do not even show up on the list.    Do I have to deslect everything?
 
Thanks,
Steve