Quote Originally Posted by FW
...I dive with two (different brands) computers, and tables on every dive. ...
Two different brands? Nitek and VR3, Hammerhead? They use different algorythm, if one goes to sleep how can you continue on the other? I would agree to have two bottom timers if you meant it.

And true, someone may drop any but pressure gauge(s) in the most of a tourist class caves. When you dove it hundred times you know approx penetration distances and depth by visual reference and time can be estimate by pressure. And when you explore the new hole you dive a lot following the same route so you learn depth and distance pretty well after a while.

ADD-ON: oh just forgot to mention, there is another computer DCAP-X right?