Ah yes (from the press release):
“It’s exciting for us at Xensr to unlock the potential of wearable technologies into sports where dedicated devices like the Xensr Air, Trace, Woo or PIQ tracker were required for detailed data like jumps and airtime."
I had assumed that this would have been a similar app to the android one. I guess this explains the shortage of hardware for warranty claims
Although this earlier post here: http://xensr.com/2017/06/
The Xensr Sessions app running on the Apple Watch connects to the Xensr Air 3D GPS wirelessly and enables athletes to integrate their Xensr Air session data into the watch. Combining motion analytics with heart rate creates a powerful tool for athletes to analyze their sessions in a new light with health data such as calories burned during their surf session, wave caught, waves attempted, swell height measurement and more. The Xensr Air combined with the Sessions app on the Apple Watch is the first surfing performance analytics solution to encompass surf data, environmental data and health data.
Seems they made huge progress between June and November.