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Understanding the Safety Stop: How Apps Support It
The safety stop is one of the most familiar habits in recreational diving. This guide explains what it is, how it differs from a decompression stop, and the limited, honest role a logbook app can play around it.
What a safety stop is
A safety stop is a short pause during ascent, commonly described by PADI as stopping at 5 metres (15 feet) for three minutes. It is recommended as an added precaution on recreational dives to give the body more time to release absorbed nitrogen gradually before surfacing. It is a widely taught habit rather than a mandatory obligation on a typical no-stop recreational dive. As with everything in this guide, the specifics of any given dive belong to your training, your briefing, and your primary instrument - not to a web article.
Why divers do it
The purpose of the safety stop is to off-gas nitrogen more slowly, reducing the chance of bubble formation associated with decompression sickness. PADI's own history of the practice notes that a Doppler study found divers who performed safety stops showed less bubble formation than those who did not, which is part of why the habit became standard teaching. Understanding the reasoning helps, but reasoning is not a substitute for training: how and whether to perform a stop on a specific dive is a decision for a qualified diver using proper instruments.
Safety stop versus decompression stop
A safety stop and a decompression stop are not the same thing. A safety stop is a precaution taken within recreational no-decompression limits - you could, in principle, surface without it. A decompression stop is a mandatory obligation that occurs when a dive exceeds no-stop limits, typical of technical diving, and skipping it carries real risk. Telling the two apart, and knowing which applies, is exactly the kind of judgement that requires training and a dive computer or tables built for that purpose.
How apps support the practice - and how DiveOne does not
A dive computer or a dedicated timer is what actually counts down a stop and tracks the ascent in real time. Apple's built-in Depth app, by its own documentation, is not a dive computer and does not provide decompression information. DiveOne's role is narrower still: it is a recreational logbook and planning companion that can help you record and review a dive afterward and export it via UDDF or JSON backup. DiveOne does not time your stop, calculate decompression, or make any go or no-go decision. Always dive with a certified primary instrument and proper training.