Picture this: You are descending through the clear winter waters of the Sea of Cortez. Below you, the massive 70-meter hull of the Santos minesweeper comes into view. You drop down to 60 feet to inspect the propellers, then slowly swim up the hull to 45 feet to glide along the main deck, before finally rising to 35 feet to check out the bridge.
This is the essence of exploring the SAAS Artificial Reef in San Carlos. You aren’t just swimming in a straight line on a flat sandy bottom; you are exploring a massive, three-dimensional steel mountain. In the scuba world, this is known as a multi-level dive.
To do this safely and get the absolute maximum amount of bottom time, old-school dive tables won’t cut it. You need a modern, high-performance dive computer calculating your nitrogen absorption in real-time. But with hundreds of models on the market, which one should you clip to your wrist? Here is your guide to choosing the best dive computers for multi-level wreck diving.
The Must-Have Features for Wreck Explorers
When you are navigating the superstructure of the Suchiate or the De La Fuente, you need a computer that provides instant, readable data without distraction. Here are the non-negotiable features you should look for:
1. Enriched Air Nitrox (EANx) Capability
As we’ve mentioned before, Nitrox is the master key to unlocking the SAAS wrecks. Because these ships rest in the 40-to-65-foot range, diving on air will severely limit your No-Decompression Limit (NDL). A wreck diving computer must allow you to easily switch your gas mix to Nitrox (typically 32% or 36%) to double your bottom time. Look for computers that let you program multiple gas mixes if you plan to progress into technical diving later.
2. A Bright, High-Contrast Screen
Wrecks cast big shadows. When you are peering into a cargo hold or swimming along the shaded side of a massive hull, a traditional LCD screen with a grey background can be incredibly difficult to read. The best wreck computers feature OLED or AMOLED color displays. These screens glow brilliantly in dark environments, allowing you to check your depth, NDL, and air pressure with a single, split-second glance.
3. Air Integration (AI)
Task loading—having too many things to think about at once—is a real danger in wreck diving. Air Integration eliminates a major task by wirelessly transmitting your tank pressure via a transmitter to your wrist computer. Instead of hunting for an analog gauge clipped to your hip, all your critical life-support data is on one screen. It also allows the computer to calculate your precise Air Time Remaining (ATR) based on your real-time breathing rate.
4. A Conservative (and Adjustable) Algorithm
Wreck diving often involves repetitive, multi-day diving. You want a computer that uses a trusted decompression algorithm (like Bühlmann ZHL-16C). More importantly, you want the ability to adjust the “conservatism” settings. If you are doing your third dive of the day on the SAAS reef, or if you are feeling a bit tired, the ability to dial up the safety margin on your computer is a crucial feature.
Top Picks for Wreck Diving Computers
While gear preferences are highly personal, a few computers stand out as the undisputed champions of the wreck and technical diving world.
The Gold Standard: Shearwater Peregrine & Teric
If you walk onto a dive boat full of experienced wreck divers, you will see a lot of Shearwaters. The Canadian company builds computers specifically for demanding environments.
- Shearwater Peregrine: This is arguably the best value in recreational diving. It features a massive, incredibly bright color LED screen, a highly customizable display, and simple, intuitive two-button navigation. It is perfect for multi-level Nitrox dives on the SAAS fleet.
- Shearwater Teric: For those who want a watch-style computer with Air Integration and a stunning AMOLED screen, the Teric is the ultimate luxury tool for the serious wreck diver.
The Smartwatch Hybrid: Garmin Descent Mk3 Series
If you want a computer that is just as useful above the water as below it, the Garmin Descent MK3 series is phenomenal. The bright AMOLED screens are beautiful in the shadows of a wreck. For boat diving in San Carlos, its built-in GPS is amazing; it marks your entry and exit points on a map, allowing you to log exactly where the wreck sits.
The User-Friendly Option: Suunto D5 or Ocean
Suunto makes fantastic, stylish computers with incredibly clear displays. The D5 and the newer Suunto Ocean models feature Air Integration, rechargeable batteries, and bright color screens. They use an algorithm that is generally considered safe and conservative, making them excellent choices for divers doing repetitive days on the local reefs and wrecks.
Don’t Just Buy It, Master It
Buying a high-end dive computer is only half the battle. To truly take advantage of a multi-level wreck dive, you need to understand exactly what your computer is telling you.
Before you tackle the SAAS Artificial Reef, enroll in the SSI Computer Diving specialty. Our instructors will teach you how to navigate your specific computer’s menus, plan multi-level profiles, adjust your safety settings, and understand how to react if your computer goes into decompression mode. Combine this with the SSI Enriched Air Nitrox course, and you will be armed with the knowledge to safely maximize every single minute of your wreck dive.
Ready to gear up and dive the wrecks? Contact Dive San Carlos today to ask about our favorite dive computers, or to book your next trip to the SAAS Artificial Reef!