iwatch and the wet coast

Hi

Information about the water resistance properties of different Apple Watch models, along with handling instructions, is detailed here:

• About Apple Watch water resistance - Apple Support
• Important handling information
• Identify your Apple Watch - Apple Support

All models of Apple Watch have a built-in heart rate sensor. Information about activity and heart rate tracking features is provided here:

• Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support
• Track workouts and stay healthy with Apple Watch - Apple Support

Apple has not advised of any changes to the heart rate sensor between model generations.

Apple Watch Series 1 is splash and water resistant, but should not be submerged in water:

About Apple Watch water resistance - Apple Support

Apple's instructions for cleaning, drying and handling your Apple Watch band are detailed here:

• Cleaning your Apple Watch - Apple Support
• Important handling information
• Band care information

Note that they include cleaning and drying your band, Apple Watch and your wrist after workouts or heavy sweating.

Are you swimming across the Atlantic?

If not it's okay to swim with the Watch Series 2 & 3. (resistance 50 meters see Apple website)

Yes . there is a heart rate sensor/monitor, best in its class.

Apple Watch - Compare - Apple

Vegan Advocate wrote:

impact resistance would be needed in case of a shark when the freestroke is changed for underwater combat in case a shark bit nicks the watch

If there are sharks in the water where you're swimming a tri, the survival of your watch is the least of your worries.

Watch Series 2 and 3 are okay in a bowl.

Sharks aside, for swimming, you would need an Apple Watch Series 2 or Series 3 model.