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I take mine diving since it's safer with me than on the boat or in my hotel/condo. But use a computer with a dive timer for backup. I guess if my computer took a dump I could time my safety stop. Hate to do a deco dive with it but I'm sure they used to back in the day with tables. These days with better gear and bigger tanks it's also not unusual for a dive to exceed one hour. Hitting the water in a speedo, no BC, and double hose regulator with a j-valve tank was literally another world compared to today. But that world was when the Submariner was designed.
(A j-valve was a primitive "Time to go up" feature in the early days of scuba diving. There weren't even pressure gauges. But the tank itself had a reserve partition. You basically breathed it dry and when you ran out of air you pulled this wire thingee attached to the valve and it opened up a reserve supply.)
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