The Nixon Ultratide is the ultimate smartwatch for surfers, featuring a custom digital module with data provided by Surfline. The Surfline forcast displayed includes, current Surfline rating, surf height, current swell height, forecasted swell height, forecasted swell direction, current water temperature, current air temperature, current sky condition, and 48 hours of tide data with predicted time and height. Connecting to your smartphone via Bluetooth, the Nixon Ultratide app (iOS only) allows you to share your session with up to 1,000 friends.