Summary: I belong to a federal disaster team and need to carry a variety of equipment. Having my PDA allows me to have my calendar, my contact list, medical references and my pictures on one device. Now this sleeve converts my PDA to a GPS! The Compact Flash slot allows me to have 8 gb of additional memory too. This allows me to carry maps for all of the U.S. and Canada, including Hawaii and Puerto Rico, and I also have my music loaded on it too!