Not my only, but if I was starting out again I'd consider an apple watch ultra over a dedicated computer. Consequences of computer failure on a well-planned ope

Not my only, but if I was starting out again I'd consider an apple watch ultra over a dedicated computer. Consequences of computer failure on a well-planned open water rec dive are fairly minimal. This doodad, plus a backup basic watch capable of working at that depth (so you have an idea of time although really your decision to surface is largely driven by air remaining) and I'd be confident. Ascent rate is the only unknown then, but you have a buddy or a group to follow. If you're really unlucky, losing your computer and your group, you just remember your training and swim up really really slowly. Missing your safety stop isn't going to kill you. Losing your dive boat might though :)