Triathlon watch: what multisport mode does and which to look at

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A triathlon watch records swim, bike and run as one activity using a multisport mode, usually with transition times included. It also tracks open-water swims by GPS and shows pace, distance and heart rate in training. You do not need one for your first sprint triathlon, but it helps once you train regularly.

This guide explains the features that matter for triathlon, what the battery and water ratings mean, and lists some current models with UK prices. We have not tested any of these watches. Specs and prices are as the brand or retailer stated them when we checked on 6 October 2026, and prices change often.

Do you need a triathlon watch for your first sprint?

No. The race records your official time, so a watch adds nothing to your result. You can finish your first sprint triathlon racing on feel. If you already own a running watch, use it for the run and your training. Our guide to triathlon for beginners covers the kit you need first.

A triathlon watch earns its place when you:

• train several times a week and want to pace sessions by heart rate, speed or power;
• swim in open water and want distance and route recorded;
• want to see how long you spend in T1 and T2, the transitions from swim to bike and bike to run;
• plan longer races, where pacing the bike and run matters more.

What multisport mode does

A triathlon or multisport mode records the whole race as one activity, split into swim, T1, bike, T2 and run. On many watches you press a button to move from one leg to the next. Garmin states that the Forerunner 970 has multisport auto-transition for swim, bike and run, so the watch changes leg for you. On the Forerunner 570, Garmin lists triathlon among more than 30 activity profiles.

In training, the same mode is useful for brick sessions, a bike ride followed straight away by a run. Our brick workout guide explains how to set one up.

Open-water swim tracking

In open water the watch uses GPS to record distance and route. Check that the model lists an open-water swim mode, separate from pool swimming, which counts lengths instead. The Suunto Race 2 page lists open water swimming among its sport modes. Only swim in open water at supervised venues; our guide to open water swimming in London lists them.

Battery in GPS mode

The figure that matters is battery life with GPS recording, since that is what a race or long ride uses. Brands quote several figures depending on settings. For example, Garmin's manual for the Forerunner 970 gives up to 26 hours GPS-only, 23 hours with automatic satellite selection and 21 hours with all systems and multi-band. A sprint or standard triathlon is covered by any of the watches below. Battery matters more for long-distance racing and long training days.

Water rating

Brands express water resistance in different ways: Garmin uses ATM ratings, Polar uses WR ratings and Apple gives a depth. Read the brand's guidance on swimming, and rinse the watch in fresh water after a lake or lido swim.

Listed triathlon watch models and UK prices

Prices change, so check the shop before you buy. Based on the stated specs:

• If automatic transitions matter to you, the Forerunner 970 is the model here where the brand states multisport auto-transition.
• If you want a triathlon profile for less, the Forerunner 570 lists triathlon among its profiles at a lower price.
• If battery for long races comes first, the COROS PACE 4 Pro and Suunto Race 2 list the longest GPS figures, but we could not confirm a UK price.
• If you mainly run and want a lower price, the Polar Pacer Pro was on sale; check its open-water and transition features with Polar before you buy.

See the Forerunner 970 at Sigma Sports

What to look for before buying

• A named triathlon or multisport mode, stated on the brand's page or in the manual.
• Open-water swim tracking, listed separately from pool swimming.
• GPS battery life that covers your longest planned race with margin.
• A water rating that the brand says is suitable for swimming.
• Size and weight you are happy to wear all day and under a wetsuit sleeve.
• Compatibility with your bike sensors, turbo trainer or training app, if you use them.

Frequently asked questions