Interesting. No surprise considering the amount of storage and computing power that can be squeezed into a cell phone these days. The next generation will include a camera and the ability to watch your favorite movies during safety/deco stops. The generation after that you’ll be able to post your dive pix during your dive. Something like this could obsolete dive guides eventually. Computer: "Now kick eastwards as fast as you can." "Stop kicking and drift with the current." "The reef has ended. Inflate your SMB and surface."