My daily-wear watch is a GMT but I've https://tinyurl.com/mw73sa6c link never quite concerned myself with watches that try to do everything. The GMT-Master II has 100m of water-resistance which is plenty if you're going to take a dip in the https://zzb.bz/P6RSas link water. If you're going diving, you're pretty much guaranteed to be reaching https://is.gd/RVc1yf link for a dive watch (or dive computer, more likely) so the idea of a dive-specific watch that can track a second time zone while you're above or below water, well, it seems kind of superfluous to me.

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