Water lock
I have an Apple Watch series 3 everywhere I’ve read says it‘S water resistant to just turn on water lock but I have don’t have that feature on my watch
Apple Watch, watchOS 4
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On your Apple Watch, make sure you’re on the Watch face. Swipe up from the bottom to bring up Control Center.
Once there, tap on the Water Lock icon (looks like a water droplet).
After it’s enabled, you’ll see the Water Lock icon appear on the top of your Apple Watch face.
Now, your Apple Watch is in Water Lock mode and will disable all input on the device until disabled.