b1draper
Contributor
DiverToBe:tank/BC/Computer(If what I gather is that a computer is what measures your depth, etc)?
I'll clearify this...
A computer will do some really great things, even the "cheap" ones. In the beginning I started out with a cheapish Wally-World watch rated to 150ft, to give you an idea at $30 a pop I went through 4 of them in a short time (flooding). I used different brands and went to different stores to get them. At that point the max I ever went was 80-100ft. So, after a few watches I realized it was time for a computer.
A computer will measure water temp, ascent rate, bottom time, NDL time, safety stop time, plus a few other things. The ascent rate monitor is great because if you come up a little too quick it knows that and adjusts your deco stop time and deco stop depth. For the NDL monitoring it will track your dive as a true multilevel dive, instead of basing on your deepest depth. There are some computers that also monitor tank pressure, and adjust your NDL based on how much air you have left. Also, nearly every computer on the market will also support Nitrox and will monitor your Oxygen Tox levels
Oh on an air dive the computer will also monitor your Nitrogen loading.