Emily ParkerBy Emily Parker

Updated November 2026

A garmin running and swimming watch can track your runs, pool laps and open-water swims without switching devices. This guide walks you through the features that matter for both sports, how to check water rating and swim modes, and how to set up your watch once you buy it. By the end, you will know which specs to prioritize for your training.

Step 1: Confirm Water Rating and Swim Support

Start with the water rating. Garmin lists a water resistance level in its specifications, usually expressed in ATM (atmospheres) or a depth in meters. Most swim-capable models carry a 5 ATM rating, which covers pool swimming and shallow open-water work. Check the manufacturer’s page before buying, because some models are rated only for splashes and rain.

Shopping for one? See our guide: Garmin Forerunner 235 GPS Running Watch Review: Pros and Cons.

Next, confirm the watch has a dedicated pool swim mode. Look for options that let you enter pool length, count laps and log stroke type. Open-water swim tracking is a separate feature, so verify it if you plan to swim lakes or the ocean.

Step 2: Check Running Metrics That Matter to You

A good running watch should provide built-in GPS, pace, distance and heart rate. For structured training, look for interval workouts, lap alerts and training load estimates. Advanced metrics such as running power or recovery time are useful for runners who follow a plan, but beginners rarely need them.

Step 3: Compare Sensors and Battery Life

Wrist-based optical heart rate sensors work well for steady running but can lag during fast intervals and may read less accurately in the water. If you swim often, check whether the watch offers a chest strap option, since many runners and triathletes use one for more precise data.

Battery life varies widely. Manufacturers typically list separate figures for GPS use, swim mode and smartwatch mode. Compare the GPS number against your longest planned session, and add a margin for cold weather, which drains batteries faster.

Step 4: Set Up Swim and Run Profiles

  1. Pair the watch with the Garmin Connect app on your phone.
  2. Update the firmware before your first workout.
  3. Create a pool swim profile and enter your pool length, usually 25 yards or 25 meters.
  4. Create a separate run profile and calibrate GPS by heading outside for a short outdoor run.
  5. Set your heart rate zones based on your maximum heart rate or a lactate threshold test.
  6. Rinse the watch in fresh water after every salt water or chlorine session.

Common Mistakes to Avoid

  • Assuming every model with a 5 ATM rating handles open-water swimming equally well.
  • Skipping firmware updates, which often improve swim tracking.
  • Forgetting to rinse the watch, leaving salt or chlorine residue on the case and band.
  • Trusting wrist heart rate during intense intervals without checking against perceived effort.
  • Choosing by feature count instead of by the workouts you actually do each week.
  • A chest heart rate strap gives steadier readings for runners and swimmers alike, since it avoids much of the motion noise that affects wrist sensors. View on Amazon
  • A quick-dry swim cap helps keep hair out of the watch band and reduces tangling during open-water sessions. View on Amazon
  • A replacement silicone band gives you a spare for pool sessions, so your primary band can dry fully between workouts. View on Amazon

If you are weighing options, our 6 Best Running Garmin Watch Picks for Every Runner (2026) breaks down several models side by side, and Garmin Watch GPS Running: 7 Best Picks for Every Runner (2026) covers GPS-focused choices.

FAQ

Can a garmin running and swimming watch track open-water swims?

Many models support open-water swim tracking, but not all do. Check the product specifications for an open-water swim activity before buying if that is your plan.

Is wrist heart rate accurate in the pool?

Wrist optical sensors can read less reliably in water, especially during fast strokes. A chest strap is generally more accurate for swim heart rate data.

Do I need to rinse my watch after swimming?

Yes. Rinsing in fresh water after pool or ocean use removes chlorine and salt, which can degrade bands and seals over time.

Conclusion

A garmin running and swimming watch works best when you match its water rating, swim modes and running metrics to your actual training. Confirm the specs on the manufacturer’s page, set up your profiles carefully, and rinse the watch after each swim. Consult a qualified coach or physician if you have heart or health concerns before starting a new training plan.

Ready to choose one?

Emily Parker

About Emily Parker

Emily Parker is part of our editorial team and reviews and edits our running gear & races guides, checking product details against manufacturer specifications and owner feedback.