When you're diving four or five times a day for a week straight, miles from the nearest dive shop, that dive computer you love on weekend trips might completely fail you. This episode tackles the specific demands liveaboard diving places on your gear, from battery life that actually lasts through 35+ dives to algorithms that won't leave you bent by day five. Ray Hollister draws on four decades of commercial and recreational diving experience to explain why most dive computers aren't built for intensive multi-day use—and which ones are.

• User-replaceable AA batteries beat rechargeable units for liveaboards. Rechargeable computers claiming 15–20 hours often die by day four or five under real conditions, while AA lithium batteries deliver 30–40 hours and can be swapped in 90 seconds with a coin.

• Algorithm conservatis ...