Keith, check your laptop - it may have a slot for an SD card already. It can't hurt to get two SD cards. If you look on Amazon there are all kinds of deals for them, like buy 2 for $15, or get one with a card reader, etc...

Are you in TN already? If so, I think they give you a special depth finder when you get there! You take off one shoe, hold your nose shut, and then step in the water!