Reference articles on the planning concepts DiveCast calculates automatically - written to stand on their own, whether or not you ever open the app.
The turn point isn't a feeling or a flat fraction of your gas - it's two specific numbers you can calculate before you're ever in the water.
Two numbers that shape every decompression stop in your plan - what they mean, and why one pair rarely fits every dive.
A worked example of solving backward from "how much gas am I carrying" to "how long can I actually survive a loop failure."
A calm-water SAC rate is a baseline, not a guarantee - here's what actually happens to gas consumption when a dive goes sideways.
Deploy too early and you spend unnecessary time at depth, where deco obligations climb quickly. Deploy too late and the boat may not find you. Here's how to calculate the window in between.
Same depth, same decompression theory underneath - but the numbers that actually drive the plan shift in specific, predictable ways.
Agency guidelines are simple and conservative on purpose. Here's what a no-fly time calculated from your actual tissue loading looks like instead.
Surface pressure already contains everything a decompression algorithm needs to know about altitude - if it's built to use it directly.
No depth change, no obvious trigger - just a gas switch that can still cause decompression sickness. Here's why.