Well, several others in this thread time their dives with a watch, but in my case I suppose it’s a throwback to my primary training, which was pre-computer. I only recently started using a computer and when my i330R failed after one day in service, it left a bad taste in my mouth for DC’s. I switched to a Peregrine, based on my LDS’s experience with Shearwater’s reliability record and quality of customer service, as well as positive comments made on SB. But it seemed like a no-brainer to have a timer as a backup, which is one of the options recommended by the manufacturer. Quoting from the risk-of-failure warning at the beginning of the Peregrine manual, whose image I’ve included below, “Never risk your life on only one source of information. Use a second computer, or
TABLES.” (Emphasis added by me). By the way, this recommendation refutes @BoltSnap’s assertion that manufacturers say not to use tables as a backup. Here it is in black and white:
View attachment 728419 I have a decades-old G-Shock (the original model) which became unreliable, so I went looking for a traditionally styled dive watch and found the Citizen on sale on Amazon for $200. There isn’t a computer in that price range that I would want.