What Is EN 13319? The Dive-Instrument Standard Explained

EN 13319 is a European standard whose full title is "Diving accessories - Depth gauges and combined depth and time measuring devices - Functional and safety requirements, test methods." It was published in 2000 and is maintained by CEN, the European Committee for Standardization. In short, it sets out functional and safety requirements, plus test methods, for the instruments divers use to read depth - and, where applicable, elapsed dive time. It exists so that a depth-measuring instrument can be evaluated against a shared, published benchmark.

The standard applies to instruments that determine water depth from surrounding (environmental) pressure, as used by divers. That includes standalone depth gauges, depth-measuring features built into other instruments, and combined depth-and-time measuring features. Its time-measurement requirements apply only when an instrument automatically counts dive time. The focus throughout is the depth and time functions specifically - the parts of a dive instrument that report how deep you are and, where provided, how long you have been down.

Importantly, EN 13319 does not cover displayed information other than depth and time. Any information about decompression obligations shown by a device is explicitly excluded from the standard's scope. That distinction matters: a device can meet a recognised depth-gauge standard while saying nothing, under that standard, about decompression modelling. So EN 13319 certification is evidence about the measuring function, not a statement that a product performs the decision-support role of a dive computer.

Apple states that Apple Watch Ultra is certified to EN 13319 (alongside WR100), describing it as an internationally recognised standard for dive accessories including depth gauges. That tells you the depth-gauge function has been tested against the standard - not that the watch is a dive computer, which Apple's own Depth app documentation confirms it is not. DiveOne relies on this same measuring hardware only for recreational logging and UDDF export or JSON backup, and keeps all safety and decompression decisions with your training and a certified primary instrument.