Hello, the mpower has a sd card slot, a compact flash card slot and a pcmcia card slot. The pk has two compact flash card slots. the pk is smaller then the mpower so it depends on your preference, I chose the mpower because the keyboard is larger so I can manipulate it better. You might want to check out both before you purchase one. robert ----- Original Message ----- From: Joshua Young To: gps-talkusers@xxxxxxxxxxxxx Sent: Wednesday, March 29, 2006 9:10 AM Subject: [gps-talkusers] GPS Packages What is the difference between the PK and Mpower BT gps? For example, does the Mpower have different requirements for cards?