When Apple launched its Apple Watch Ultra in September, the company said it would be a fully-fledged diving computer, but the Oceanic+ app that allows that was supposed to launch at a later date.

The Oceanic+ app is available in the App Store.

According to Apple, the Watch Ultra is intended for recreational scuba divers who can dive up to 40 meters. Divers can use the app to set up and monitor all the parameters they need for a safe dive, even though the Ultra has water temperature and depth sensor. The app calculating the no-decompression time, which tells the diver how long they can stay at a certain depth, is included with the diveplanner.

Apple Watch Oceanic Plus

Oceanic+'s primary screen shows current depth, no-decompression time, dive time, and water temperature, among other info. Credit: Apple

Other features include tide and water temperature data, as well as information on visibility and currents, and other goodies that divers might find useful. The app brings new factors into play, such as no-fly time, surface time, as well as access to the diveplanner or dive settings, to their preferred watch face.

The larger size of the 49mm Watch Ultra, compared to the regular Apple Watch, should help divers see all the information they need while underwater. Apple claims that the Watch Ultra will work through a 7mm-thick wetsuit.

Only the Apple Watch Ultra running watchOS 9.1 is compatible with the Oceanic+ app. The free version of the app offers functions such as depth and time, and logging recent dives; for more advanced functions, users will have to pay a monthly fee or yearly fee.