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- I just don't log dives
ok so i was doing my 3rd dive this holiday, and i used up my air VERY quickly, (probably from chasing fish in circles to do my digital photography spec), but at 800psi i let my DM know of my air situation. he said ok and continued going along.
Actually, you missed asking a good question here:
Q: "What happens when you think you're low on air and you're being ignored".
A: "A thumb is a statement, not a question." When you want to surface, it's time to go. If you show the DM your air and you're low and he doesn't seem to care, that's his problem. He's still breathing and if you continue on, you won't be. When it's time to go, it's time to go, regardless of anybody else's opinion.
When you went to the DM and showed 800PSI, you probably felt that you were getting low, which you were. Most boats want you back with 500 PSI in the tank, which meant that even from a reasonably shallow dive, and especially if you're sucking gas quickly, you were at about the right pressure for a nice slow ascent and a safety stop.
As for the weighting, you need to do a buoyancy check and see what it takes to just get you under the water with an almost empty tank and an empty BC and no finning. Anything else is just a guess.
Terry