Dive computer wrist

A wrist dive computer is an essential device for monitoring depth, bottom time, and decompression stops in real time.

About this subject

Wrist dive computers have replaced traditional pressure gauges and dive tables, offering automatic decompression calculations based on algorithms such as Bühlmann or RGBM. These devices continuously monitor depth and time, adjusting no‑decompression limits according to the dive profile and gas mixture. Modern units include heart rate sensors, digital compass, Bluetooth connectivity for log downloads, and dedicated modes for nitrox or trimix diving. The LCD or OLED screen displays critical information like ascent rate, water temperature, and tank pressure when paired with a wireless transmitter. Battery life ranges from 1 to 3 years under typical use, depending on battery type and frequency of dives. The wrist format is the most popular among recreational divers for its convenience and constant visibility, manufactured by brands such as Suunto, Garmin, Shearwater, and Oceanic. The history of dive computers began in the 1980s with the Deco Brain, but they became widespread in the 2000s as electronic components were miniaturized.

Frequently Asked Questions

How does a dive computer calculate no‑decompression limits?

It uses a decompression algorithm that models nitrogen absorption and elimination in body tissues based on depth and time. The most common algorithm is Bühlmann ZHL‑16, often enhanced with gradient factors for added safety.

Can I use the same wrist computer for freediving?

Some models have a specific freediving mode, but most are designed only for scuba diving with air or nitrox. Check the manual: freedive mode disables deco calculations and logs depth and dive time.

What is the battery life of a wrist dive computer?

Typically between 1 and 3 years, depending on the model and usage frequency. Rechargeable lithium batteries last less per charge but can be recharged. Button cells (CR2032 or similar) last longer but require replacement.