NJdiver85
Contributor
In order to get appropriately weighted, the common directive is to use a tank with approx 500 PSI of air in it, and determine how much weight you need such that you can just sink below the surface with your bc fully deflated. The problem with this, which I see all the time, is that because you can only do this buoyancy check at the end of a dive, that first dive amounts to alot of guess work. Isn't a better procedure something like this: With a FULL tank of air, determine how much weight is necessary such that you just sink below the surface with your BC fully deflated. Once that weight amount is determined, add to that an amount to compensate for the bouyancy swing in the tank as it goes from full to 500 PSI. For an AL80, that should be close to 5 pounds.