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I believe the bidirectional functionality was to make it easier to time and reset navigational waypoints while underwater. That’s also why the original FXD has a countdown bezel.
I fully understand the purpose of a unidirectional count-up bezel on a divers watch, I just didn’t understand why they had changed to that more conventional design on this new version, when that was part of the FXD’s raison d’etre. But then I read the marketing guff about US military spec divers watches and it makes sense.
Regal
Aroogah
Ah. Still. Not sure why that is a surprise then.
From a safety standpoint, as a recreational diver you only want the unidirectional bezel if you are relying on your watch to track time. Not sure what advantage you get out of bi-directional for military use.