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Gradient Factors
/gradientfactor
A Bühlmann ZHL-16C sandbox. Move the GF pair and watch tissue tensions, M-values, the ceiling and the whole stop schedule move with it.
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First-Stage Regulator
/regulator
A working model of the valve that keeps you breathing. Change depth and tank pressure and watch spring, water and gas pressure balance each other in real time. EN/TH.
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Regulator Lab
/regulator-lab
Step through how every kind of regulator works, first stage and second: unbalanced and balanced pistons, the diaphragm, downstream valves and the venturi knob. Drag depth and cylinder pressure, and hold Breathe to watch a live breath.
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Underwater Photography
/photography
A camera you can get wrong for free. Set aperture, shutter, ISO and strobes and watch the frame respond — wide angle and macro, backscatter, depth of field, and drills to practise before you get wet. EN/TH.
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Underwater Navigation
/navigation
A dive site you can get lost in for free. Compass, first-person view, current and limited visibility on four maps. Reciprocal and pattern navigation, search and recovery, natural navigation and leading a dive. EN/TH.
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Buoyancy Trainer
/buoyancy
Neutral buoyancy is four controls that all answer late. Watch the delay between the button and the depth drawn to scale, then practise three scored drills against it — weight check, safety-stop hover, and a breath-only fin pivot. EN/TH.
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Tides & Currents
/tides
The current is not the tide — it is the slope of the tide. Tide curves for Thai dive sites, computed from real gauge records where a gauge exists and from a global tide model where none does, with slack windows, spring and neap, and an estimate of how hard the water will be running — plus a year planner built on the Navy’s printed tide tables, with a trip window finder. EN/TH.
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