The "RATE" column represents how much air an average, non-panicked diver uses at any particular
depth.
The
"TIME" Column represents how long it takes to surface from a particular depth assuming a conservative rate of half
a foot per second.
Then below
each popular size of pony tank you can see how much air time you can expect at a particular depth.
If your estimated
air time is greater than the "TIME" required for a safe ascent you are in the green. If it's close, you are in the yellow.
I suggest you stay in the green
!!!This is
for non-decompression dives only; it calculates time to ascend directly!!! WITHOUT!!! Any safety stop.!!!
!!!This chart
is based upon the "average diver" and should not be used to calculate actual usable bottom time.!!!
!!!You should
never intentionally deplete your primary air source with the intention of making it back to the surface with your pony.!!!
This chart
is here as a courtesy tool to help you choose a pony size and should under no circumstances be used by idiots, morons, know-it-alls,
show-offs or other Darwin Awards candidates
