The Scuba Gear Lab

Pre-Dive Computer Checklist: Setup and Safety Verification

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A dive computer that fails at depth transforms a relaxing underwater adventure into a dangerous guessing game—and the problem almost always traces back to rushed pre-dive setup. In this episode, Marcus Okafor walks through the systematic verification checklist he's refined across thousands of dives, from tropical reefs to cold-water wrecks. Whether you're a new diver still learning your equipment or an experienced one who can't shake that nagging feeling you've forgotten something, this step-by-step routine covers everything from battery checks to algorithm configuration so you can focus on enjoying the dive instead of worrying about your gear.

  • Check your battery status before suiting up—anything below 30 percent means you should replace or charge before diving, not discover the problem mid-trip like Marcus did on a Palau live-aboard.
    • Condensation or water droplets visible behind the screen glass signals o-ring failure or case damage, meaning your computer is already compromised and will likely flood completely at depth.
      • Forgetting to switch out of gauge mode leaves you with zero decompression information mid-dive—always verify you're in the correct dive mode (air, nitrox, technical) before descending.
        • When diving enriched air, your computer's oxygen percentage must match your cylinder analysis exactly; diving 32 percent nitrox while your computer assumes air gives you dangerously misleading no-decompression limits.
          • Test audible alarms in setup mode before every dive—silent alarms from malfunctioning speakers can't warn you about ascent rate violations when you need it most.
            • Accurate time and date settings aren't just cosmetic; your computer uses timestamps to calculate surface intervals and residual nitrogen loading between dives.

              • Read the full article: https://thescubagearlab.com/pre-dive-computer-checklist

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              The Scuba Gear LabBy The Scuba Gear Lab