Garmin and Apple Watch provide the heart rate and GPS

Form, the augmented reality swim goggles, is updating its headset to be used for open water swimming – and it’s leveraging smartwatches for the extra sensor data.

The connected swimming goggles got a massive 4.5/5 score in the Wareable review – and we loved the ability to view performance metrics like split times, distance, stroke rate, pace per 100 in real time. However, it was always limited to the pool.
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https://www.wareable.com/swimming/form-ar-swim-goggles-hook-up-with-apple-watch-and-garmin-7973