The Water Drop icon on the Apple Watch. What does it do?

Any Apple Watch from Series 2 onwards is water-resistant to 50m. But what is that icon in the menu, and how does that change the way the watch functions? Find out in the video below:

Oh, by the way, I'm experimenting with a new blog, and there is more info about this watch, and other stuff, there. Here's a link to get you started.

Let me know what you think.

Stay safe, everybody.

D