Guides
A dive computer tracks nitrogen for you, but you still need to know what its numbers mean. These guides cover no-decompression limits, how algorithms differ, nitrox and planning gas for a dive.
Where an article uses a formula, you can check the result with the calculators on this site.
Dive Computers & Decompression8 min read
CNS % and OTU explained with a worked four-dive EAN32 day, NOAA single and 24-hour limits, REPEX multi-day OTU limits and the symptoms to know on a liveaboard.
Read moreDive Computers & Decompression8 min read
How to calculate rock bottom (minimum gas) for two divers sharing one tank: a worked 30 m example, how it compares with thirds and 50 bar, and turn pressures.
Read moreDive Computers & Decompression10 min read
How dive computer algorithms work: tissue compartments, M-values, Bühlmann vs RGBM, gradient factors like 30/70 vs 40/85, and why two computers disagree.
Read moreDive Computers & Decompression8 min read
Step-by-step nitrox MOD at 1.4 and 1.6 bar, EAD checked against an air table, best mix for a planned depth, and how to analyse and label a tank.
Read moreDive Computers & Decompression8 min read
NOAA no-stop limits on air, EAN32 and EAN36 at 12-33 m, what the fatigue studies found, what nitrox costs, and the dives where it adds nothing.
Read moreDive Computers & Decompression7 min read
A worked SAC rate example from a logged dive, what the number is for, and the measured effects of workload, cold, stress, trim and weighting on your air use.
Read moreDive Computers & Decompression8 min read
Plan a second dive with the DECO 2000 table: group letter, surface interval and residual nitrogen time, with a worked two-dive day and how long to wait.
Read moreDive Computers & Decompression8 min read
Read Dr. Max Hahn's DECO 2000 table step by step: round depth and time up, find the no-stop limit, stops and group letter, then follow one worked dive.
Read moreDive Computers & Decompression8 min read
Apple rates the Watch Ultra for recreational dives to 40 m, but only an app like Oceanic+ makes it a dive computer. Specs, paid plans, gases and limits.
Read moreDive Computers & Decompression8 min read
Dive computer failed during a dive? The ascent steps makers and DAN give, how long to stay out of the water, why lockouts happen, and backup options.
Read moreDive Computers & Decompression8 min read
Air-integrated dive computer vs SPG: how hoseless transmitters work, how makers calculate gas time remaining, what happens on signal loss, and the real cost.
Read moreDive Computers & Decompression9 min read
A buyer's checklist for your first dive computer: screen, conservatism settings, nitrox, air integration, battery, gauge-mode lockouts and price tiers.
Read moreDive Computers & Decompression7 min read
Minutes of gas for a 12 L, 200 bar tank at 10, 18 and 30 m by SAC rate, the aluminium 80 version, and why the reserve and ascent gas come out first.
Read moreDive Computers & Decompression8 min read
What a no-decompression limit (NDL) is, NDLs at 12-42 m from the DECO 2000 and US Navy tables, why dive computers disagree, and what to do if you overshoot.
Read moreDive Computers & Decompression9 min read
What Doppler studies show about safety stops, what PADI, BSAC, VDST and dive computers recommend, the NEDU deep stop result, and how to hold a stop in current.
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