@CroShark
Before the latest update, I had excellent results with the Vertical in open water.
I can honestly say that, compared to people using Garmin (fenix, forerunner ) and COROS (apex pro)devices (swim side by side always freestyle technique), my trackings were equally good — if not better and more reliable — even under cloudy skies and sea wave conditions.
I assume this is some kind of glitch or bug introduced in the recent update, as a soft reset hasn’t resolved the issue. I’m confident it’s not a hardware problem, since the watch performs flawlessly in every other use case.
I hope this will be improved in a future update, before I consider doing a hard reset.