a dive computer is more of a "nice to have" then a necessity. You can calculate everything you need to know after the fact, if you have a good idea of your aver

a dive computer is more of a "nice to have" then a necessity. You can calculate everything you need to know after the fact, if you have a good idea of your average depth and downtime. If you're a casual diver (i.e. two dives a day on vacation, maybe a night dive here and there) you don't need a computer at all