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Diving Watch: A Guide to the Essential Tool for Underwater Exploration

A diving watch, also known as a diver’s or dive watch, is a watch designed for underwater diving that features, as a minimum, a water resistance greater than 100 meters. A diving watch is not only a timepiece, but also a tool that divers use to monitor their elapsed dive time, which is crucial for avoiding decompression sickness. While dive computers have replaced the need to use a diving watch, many people choose to wear one as a backup in case the computer fails, or as a stylish accessory that reflects their passion for diving.

What Makes a Diving Watch?

A diving watch has to meet certain standards and specifications to be considered as such. The most widely recognized standard is the ISO 6425, which defines the minimum requirements and testing methods for diving watches. Some of the main features of a diving watch according to the ISO 6425 are:

• Water resistance: The watch must be able to withstand water pressure at a depth of at least 100 meters, and have a margin of safety of 25%. The water resistance must be indicated on the dial or caseback in meters or feet.
• Bezel: The watch must have a unidirectional rotating bezel with markings at least every five minutes, and a pre-select marker (usually a luminous dot) to indicate the start of the dive. The bezel is used to measure the elapsed time of the dive by aligning the marker with the minute hand at the beginning of the dive.
• Dial: The watch must have a clear and legible dial with hour, minute and second hands, and an indication of time in hours and minutes that can be read in the dark. The dial must also have an end-of-life indicator (usually a second hand that jumps in four-second intervals) to warn the diver when the battery is low (for quartz watches).
• Case: The watch case must be made of corrosion-resistant material, such as stainless steel, titanium or ceramic. The case must also protect the watch from shocks, magnetic fields and saltwater. The caseback must be solid and secured by screws or bolts.
• Crown: The watch crown must be screw-down or have another secure locking mechanism to prevent accidental adjustment of the time or date during the dive. The crown must also have a water-resistant seal.
• Crystal: The watch crystal must be made of scratch-resistant material, such as sapphire or mineral glass. The crystal must also be thick enough to withstand water pressure and prevent deformation.
• Strap: The watch strap must be made of durable and water-resistant material, such as rubber, silicone, nylon or metal. The strap must also have a secure clasp or buckle that can be easily adjusted to fit over a wetsuit or drysuit.

How to Choose a Diving Watch?

There are many factors to consider when choosing a diving watch, depending on your personal preference, budget and diving needs. Some of the main aspects to look for are:

• Movement: The movement is the mechanism that powers the watch and determines its accuracy and functionality. There are two main types of movements: mechanical and quartz. Mechanical movements are powered by a spring that needs to be wound manually or automatically by the motion of the wrist. Mechanical movements are more expensive, complex and require regular maintenance, but they are also more prestigious, durable and have a smoother sweep of the second hand. Quartz movements are powered by a battery that needs to be replaced every few years. Quartz movements are cheaper, simpler and more accurate than mechanical movements, but they are also more susceptible to shocks and magnetic fields, and have a less smooth sweep of the second hand.

• Style: The style of the diving watch is largely a matter of personal taste, but it can also reflect your diving personality and lifestyle. There are many styles of diving watches, ranging from classic and elegant to sporty and rugged. Some divers prefer a simple and minimalist design that focuses on functionality and readability, while others prefer a more elaborate and ornate design that showcases craftsmanship and features. Some divers opt for a versatile and adaptable style that can suit any occasion and outfit, while others choose a distinctive and unique style that expresses their individuality and passion for diving.

• Features: The features of the diving watch are the additional functions that enhance its performance and usefulness. Some of the common features of diving watches are:

  • Date display: A date display shows the current date on the dial, usually in a small window. A date display can be useful for keeping track of the day and planning your dives.
  • Helium escape valve: A helium escape valve is a small device that allows the release of helium gas that may accumulate inside the watch case during saturation diving. Saturation diving is a type of diving that involves staying in a pressurized chamber or habitat for long periods of time, and breathing a gas mixture that contains helium. Helium molecules are very small and can penetrate the watch case and crystal. If the watch is not equipped with a helium escape valve, the helium gas may cause the crystal to pop off or the case to rupture when the diver ascends and the pressure decreases.
  • Depth gauge: A depth gauge is a device that measures the depth of the water and displays it on the dial or bezel. A depth gauge can be useful for monitoring your depth and avoiding exceeding your dive limits.
  • Chronograph: A chronograph is a device that measures and records elapsed time intervals, such as dive time, surface interval or decompression stop. A chronograph usually has one or more subdials and pushers on the case that control the start, stop and reset functions.
  • GMT: A GMT (Greenwich Mean Time) function allows the watch to display a second time zone, usually indicated by a 24-hour hand and a rotating bezel with 24-hour markings. A GMT function can be useful for traveling divers who need to keep track of different time zones.

What are Some of the Best Diving Watches?

There are many diving watches available on the market, each with its own advantages and disadvantages. Here are some of the best diving watches that we have tested and reviewed:

• DELMA Cayman Bronze: A robust and stylish watch with a Swiss automatic movement, a bronze case and bezel, a sapphire crystal, a date display, a mesh bracelet and a water resistance of 500 meters.
• Tissot Seastar 1000 Powermatic: A breathtaking and elegant watch with a Swiss automatic movement, a stainless steel case and bracelet, a sapphire crystal, a date display, three subdials, a helium escape valve and a water resistance of 300 meters.
• DELMA Blue Shark III: An extreme and durable watch with a Swiss automatic movement, a titanium case and bracelet, a sapphire crystal, a date display, a helium escape valve, a depth gauge and a water resistance of 4000 meters.
• Deep Blue Nato Diver: A classic and versatile watch with a Japanese quartz movement, a stainless steel case, a mineral crystal, a date display, an end-of-life indicator.