Can You Swim With Garmin Forerunner 165? | Pool-Ready Setup

It’s rated for swim use, and it can track pool and open-water sessions when you set the right activity, settings, and post-swim care.

You bought the Forerunner 165 for training, then the next thought hits: what happens when it meets the pool? Good news. This watch is built to handle swim sessions, not just sweaty runs. The trick is using the right mode, knowing what “5 ATM” covers, and treating the watch well after chlorine or saltwater.

This article shows what’s safe, what’s risky, and how to set the watch up so your swim data actually makes sense. You’ll also get a tight checklist you can save, plus a settings cheat sheet for pool days.

Can You Swim With Garmin Forerunner 165? What The Rating Covers

The Forerunner 165 carries a “Swim, 5 ATM” water rating. That means it’s made for surface swimming and pool use, not deep diving. You can wear it for laps, open-water swims, splashes, and rain without babying it.

Two details matter more than the number on the box:

• Pressure spikes are the real threat. A strong jet of water can push past seals more easily than calm immersion.
• Heat plus water can stress gaskets. Long hot showers, saunas, and steam rooms are common “I didn’t think about that” mistakes.

If you stay in the “swim” lane of activities, you’re on solid ground: pool workouts, easy open-water efforts, and normal wear around water.

Swimming With The Forerunner 165 In Pools And Open Water

The watch isn’t just safe in water. It also has swim activities built in, so you can record distance, pace, and stroke-related metrics for open water. Garmin documents open-water swim recording in the Forerunner 165 manual, including the basic start/stop flow and the kinds of metrics it captures.

Pool swims and open-water swims behave differently on a watch:

• Pool sessions use your arm motion and turns to count lengths. Clean push-offs and consistent turns help accuracy.
• Open water leans on GPS once you’re outside with a signal lock. Sighting breaks and choppy water can add noise to the track.

If your main goal is lap counting, the pool profile is where you’ll spend most of your time. If you want distance on a lake or ocean swim, open water is the right pick.

What To Expect From Heart Rate In The Water

Wrist heart rate can be less steady in water. Water between the sensor and skin, looser strap tension, and repeated flexing can cause gaps or spikes. Tightening the band one notch for swims often helps. If you see odd jumps, treat them as signal noise, not a sudden change in fitness.

Buttons Beat Touchscreen When You’re Wet

Water drops can trigger accidental taps on a touchscreen. When you’re mid-set, physical buttons feel calmer and cleaner. Before you start, check that you can pause, lap, and save with buttons alone so you’re not fighting the screen with wet fingers.

Pool Setup That Makes Your Data Trustworthy

Most swim “bad data” problems come from setup, not from the watch. Spend two minutes before the first lap and you’ll save yourself a pile of frustration later.

Set The Correct Pool Length

The watch needs to know the pool length so it can convert lengths into distance. If you pick 25 m and you’re swimming 25 yd, your totals will drift fast. If your pool is unusual, use a custom length and save it for next time.

Start Your Set With A Clean Push-Off

Pool distance detection relies on the rhythm of your stroke and the signature of a turn. A clean push-off and a short glide help the watch catch the start of each length. If you start by wading and paddling, the first length can miscount.

Use Rest Periods With Intent

When you stop at the wall, the watch needs a clear “rest” signal. If you float, scull, and chat while staying in motion, it may treat that as slow swimming and add stray distance. During rest, pause or stop moving your arms in a swim-like pattern.

Log Drill Sets The Smart Way

Kickboard work and one-arm drills can confuse length detection because the motion pattern changes. If you do drills often, plan to record them as drills and enter distance manually for that part of the workout. Your totals will end up closer to reality, and your pace data won’t get warped by a kick set that looks like “random movement” to an algorithm.

Care Rules That Keep The Watch Healthy Over Time

Swimming is fine. Neglect after swimming is where wear shows up. Chlorine and salt don’t usually cause instant failure, but they can irritate skin, dry straps, and leave residue around buttons if you never rinse the watch.

Rinse After Chlorine Or Saltwater

After a pool swim, rinse the watch under cool, gentle running water. After open-water swims, rinse even more carefully, since salt crystals can form as water dries. Pat it dry with a soft towel, then let it air-dry before charging.

Avoid High-Pressure Water

Skip blasting the watch with a high-pressure faucet sprayer. Skip pressure washer mist. Skip “let me rinse it in the shower stream.” Calm water is your friend here.

Charge Only When It’s Dry

Water in the charging area can cause charging problems and corrosion over time. Dry the watch fully before you connect it to power. If you swim daily, set a habit: rinse, towel dry, air-dry, then charge later.

Watch Out For Lotion And Sunscreen Buildup

Greasy residue can interfere with optical sensor readings. A quick rinse and gentle wipe keeps the sensor window clearer. If you use sunscreen on your wrist, wipe the watch back after the session.

What “5 ATM” Means In Plain Language

Water ratings can feel confusing because “50 meters” doesn’t mean you can swim down 50 meters with confidence. The number is tied to lab pressure tests, not real strokes, splashes, and jets.

Garmin publishes a water rating chart that spells out what 5 ATM is meant to handle and what it’s not meant to handle. It’s one of the cleanest ways to sanity-check your use before you do something risky with a watch you like. Garmin water rating chart lays out those activity boundaries in plain terms.

Think of your swim use like this: laps, easy open water, and surface play are fine. High-speed water sports and scuba are outside the intended zone.

Water Activities Checklist For The Forerunner 165

Use this table as a fast decision tool. It’s not a hype list. It’s the practical “should I do this with my watch on?” view.

Activity	Wear It?	Notes For Cleaner Results
Pool lap swimming	Yes	Set pool length, start with a clean push-off, keep rests still.
Open-water swimming	Yes	Start outside with GPS lock, keep strap snug, rinse after saltwater.
Water aerobics	Yes	Use a cardio profile if swim metrics don’t fit the movement pattern.
Shallow snorkeling	Usually	Surface level is fine; rinse well after; avoid deep dives.
Hot shower with strong spray	No	Heat and direct jets are a rough combo for seals over time.
Sauna or steam room	No	Heat can stress gaskets; leave it outside and cool.
High-speed water sports	No	Fast impacts and pressure spikes can exceed intended use.
Scuba diving	No	Not a dive-rated device; use proper dive gear.
Rinsing under gentle tap water	Yes	Cool water is fine; dry fully before charging.

How To Record A Swim So It’s Easy To Read Later

A clean recording makes the post-swim review simple. You want totals you can trust, not a mystery file you’d rather ignore.

Pick The Right Activity Before You Hit The Water

Use the pool swim activity for lap sessions. Use open water for outdoor swims. Garmin’s Forerunner 165 manual notes you can record open-water swim data like distance and pace, and it outlines the basic steps to start the activity and save it after you finish. Forerunner 165 open-water swimming instructions show the flow Garmin intends.

Use Auto Rest Only If Your Set Matches It

Auto rest can work well when you stop cleanly at the wall. If you tend to float and chat while moving your arms, you might get weird “extra” distance. If that’s your style, pausing manually can be cleaner.

Mark Intervals If You Care About Splits

If you’re doing structured sets, use lap/interval markers. It takes a second and saves you later. You’ll be able to spot which set drifted, which set felt smooth, and where your pace dropped.

Don’t Stress Over One Odd Length

A single weird length usually comes from a mid-pool stop, a sudden backstroke switch, or a messy turn. Fix the habits that cause repeats. One stray length in an hour swim won’t ruin training.

Swim Settings Cheat Sheet For Fast Setup

If you want a “set it and go” setup, this table keeps the knobs you’ll touch most often in one place.

Setting	Good Default	When To Change It
Pool length	Match your pool (25 yd, 25 m, 50 m)	Change when you switch pools or travel.
Data screens	Time, distance, pace	Add stroke rate if you’re working on form.
Auto rest	On	Turn off if you move a lot during rests.
Alerts	Off	Turn on for long steady swims where you want distance cues.
Button lock / screen lock	On in water	Turn off only if you need frequent touchscreen inputs.
Strap tightness	One notch snugger than daily wear	Loosen after the swim to avoid irritation.

Common Swim Problems And Simple Fixes

Lap Count Is Off

This is usually a turn issue. If you stop mid-lane, the watch may miss the length. If you do a soft touch and drift into the wall, it may not detect the turn cleanly. Push off with purpose, then settle into your stroke.

Distance Is Wrong In Open Water

GPS needs a clean lock before you start. Begin outside with a clear view of the sky and wait for the signal. During the swim, frequent pauses and tight zig-zags from sighting can shorten or kink the track.

Heart Rate Looks Weird

Tighten the strap slightly. Keep the sensor flat on skin. If you still see noisy readings, treat pace and effort as your main swim cues and use heart rate as a rough trend.

Buttons Feel Sticky After A Swim

Rinse the watch under cool water and press each button a few times while rinsing, using gentle flow. Dry well. If you swim in saltwater, rinse soon after you get out, not hours later.

Safe Swim Habits That Pay Off

Here’s the short list you can follow every swim day:

• Pick pool swim or open water before you get wet.
• Confirm pool length once, then leave it alone.
• Start with a firm push-off so the first length counts cleanly.
• During rest, stay still or pause so the watch doesn’t guess wrong.
• Rinse after chlorine or saltwater, then dry before charging.
• Skip hot water jets and heat-heavy sessions with the watch on.

If you stick to that, your watch stays healthier, and your swim logs stay readable. That’s the real win: you get data you can trust without turning swim day into a tech project.