Swim not recording correctly

Hi ThomasHauber,

Thank you for posting in Apple Support Communities! According to this article: Swim with your Apple Watch, to get better results you'll want to make sure that the correct information was entered during setup.

Your Apple Watch estimates your measurements during workouts based on the information that you entered during setup. Here's how each workout is measured: 

Pool Swim: When you start a workout, be sure to accurately set the pool length to help your Apple Watch measure laps and distance. GPS isn't used during a Pool Swim, and water might prevent a heart-rate measurement, but calories, laps, and distance will still be tracked using the built-in accelerometer.

Open Water Swim: GPS will only provide distance when you do a freestyle stroke. Water might prevent a heart-rate measurement, but calories will still be tracked using the built-in accelerometer.

If you need to update your personal information you can open up the Watch app on your iPhone, tap the My Watch tab > tap Health > Health Profile. Tap edit and then tap the item that you want to change.

Check out this article for more information: Get the most accurate measurements using your Apple Watch

Hope that helps!

ThomasHauber,

If you're setting the pool length beforehand then it should definitely be able to track the distance accurately. Have you tried working through the steps in Calibrating your Apple Watch for improved Workout and Activity accuracy?

Have you also checked if you're getting accurate readings from any other activities that you might use the Apple Watch for?

Cheers.

ThomasHauber,

For further support, please Contact Apple Support.

Best wishes.