Choose a fitness tracker for swimming by matching it to your swim type—pool swimmers need lap counting and stroke detection, while open-water swimmers need GPS and long battery life.
Picking the right swimming fitness tracker comes down to one question first: where do you actually swim? A device that shines in a 25-yard pool can struggle on a mile-long lake crossing, and the reverse is just as true. The good news is that both Apple and Garmin make swim-specific options, and the deciding factors are clear once you know what to look for.
Pool Swimmers: Lap Count, Stroke Detection, and SWOLF Matter Most
For lap swimming, the tracker needs to handle the repetitive, turn-heavy nature of pool work without GPS. Both Apple Watch and the Garmin Swim 2 handle this well, but each tracks slightly differently.
Apple Watch includes a dedicated Pool Swim mode in the Workout app. Before starting, you set the pool length—critical for accurate distance—and the watch then automatically tracks your sets and rest periods. The workout summary shows your strokes used and total distance, with per-set pace available in the iPhone workout summary.
The Garmin Swim 2’s pool mode records distance, pace, stroke count, stroke type, and SWOLF. One useful detail: the next pool swim automatically uses the pool size you saved from the previous session, so frequent pool swimmers only set it once.
What Should Open-Water Swimmers Look For?
Open-water swimming changes the equation entirely. Without walls to push off and flip at, you need built-in GPS to track distance accurately, and you need enough battery life to cover the full session.
For Apple Watch users, the Open Water Swim mode in the Workout app relies on the watch’s GPS to record your route and distance. The Garmin Swim 2 uses its built-in GPS in open-water mode, recording distance, pace, stroke count, SWOLF, stroke rate, and stroke distance.
Battery life is a real consideration here.
Water Resistance: Know the Limits Before You Buy
A tracker rated “splash-proof” is not a swimming tracker. Look for an explicit water resistance rating that matches your activity.
The Garmin Swim 2 carries a 50-meter water resistance rating, and Garmin notes it’s designed for surface swimming—not diving.
One caveat applies across the board: water resistance is not permanent. Apple states it can diminish over time as seals wear, so treat any rating as a current capability, not a lifetime guarantee.
Key Differences: Apple Watch Ultra 3 vs. Garmin Swim 2
| Feature | Apple Watch Ultra 3 | Garmin Swim 2 |
|---|---|---|
| Water resistance | WR100 (recreational diving to 40 m) | 50 m (surface swimming) |
| Pool swim tracking | Sets, rests, strokes, SWOLF | Distance, pace, stroke count/type, SWOLF |
| Open-water tracking | GPS via Open Water Swim mode | Built-in GPS with stroke data |
| Battery (typical) | Up to 42 hours (72 in Low Power Mode) | Up to 7 days smartwatch; 13 hours GPS |
| Pool length setup | Set before each pool session | Saves last pool size automatically |
Both trackers are excellent, but they serve different swimmers. The Garmin Swim 2 is the more focused swim tracker, with dedicated metrics and a battery that stretches far longer between charges. If you’re weighing your options side by side, our tested roundup of swim-ready activity trackers breaks down more models and real-world performance.
Setting Up Your Swim Workout Correctly
Apple Watch Pool Swim: Open the Workout app, turn the Digital Crown to Pool Swim, set the pool length, then tap Start. The watch handles sets and rest automatically from there.
Apple Watch Open Water Swim: Open Workout, turn the Digital Crown to Open Water Swim, then tap Start. GPS activates automatically.
Garmin Swim 2 Pool: Select the pool swim activity profile. The watch records distance, pace, stroke count, and stroke type. Your saved pool size carries over from the last session.
The most common mistake is skipping the pool length setup on Apple Watch—if the watch thinks the pool is 25 yards when it’s actually 50, every distance metric is off by double.
FAQs
Can I wear a fitness tracker in the ocean?
Yes, if it’s rated for swimming and you rinse it with fresh water afterward. Salt water is corrosive, and Apple notes water resistance can diminish over time, so rinsing extends the seals’ life. Open-water mode with GPS is the right tracking choice for ocean swims.
What does SWOLF mean on a swim tracker?
SWOLF combines stroke count and time to measure swimming efficiency—lower is better, like golf. Garmin’s Swim 2 records it in both pool and open-water modes, while Apple Watch tracks it in pool swims. It’s most useful for pool training where stroke technique matters.
Do I need GPS for pool swimming?
No. GPS signals don’t work reliably indoors or underwater, which is why pool modes use motion-based tracking instead. Save GPS for open-water sessions where distance comes from your actual route rather than wall-to-wall laps.
References & Sources
- Garmin. “Garmin Swim 2 Pool and Open Water Tracking Support.” Details pool swim metrics and pool size memory.
- Apple. “Go for a Swim with Apple Watch.” Official steps for Pool Swim and Open Water Swim modes.
- Garmin. “Garmin Swim Owner’s Manual.” Confirms 50 m water resistance and surface-swim design purpose.