Hyperoxic Myopia: Information for Divers
Exposure to excessive oxygen can impair distance vision.
This phenomenon, called hyperoxic myopia, is a form of oxygen toxicity that affects the ...
NERD 2 Battery Replacement
The typical battery life is 5 years or 500 charge cycles.
The battery can be replaced at authorized service centers. The cost of replacement is $1...
Planning Advanced Dives: Choosing the Instructor
Socrates is widely regarded as one of the individuals that shaped the world. It is believed by some that its history would be profoundly different...
Release Notes Shearwater Desktop 3.1.4
New Features/Improvements:
Improved Bluetooth Reliability with the initial connection.
Bug Notes:
Added software workaround to allow users with ...
The CO2 Scrubber in a Diver’s Rebreather
How long a CO2 scrubber lasts during a dive depends on many factors. I will mention some of the ways that CO2 can be removed from the breathing gas. I will also discuss ways to measure how long a scrubber will last (called the endurance time) and some of the factors that change it, but first will discuss why it is necessary at all.
Why UPTD Calculations Should Not Be Used
Just over 45 years ago, in 1970, researchers at the University of Pennsylvania used the best information available at the time to derive a model fo...
Oxygen Seizures at PO2 ≤ 1.6 Bar: How Rare?
Learn about the signs and symptoms of central nervous system (CNS) oxygen toxicity and the likelihood of oxygen seizures.
Petrel 1 & 2 / Perdix & Perdix AI Firmware V44 Release Notes
A note on models: The Petrel, Petrel 2, Perdix, and Perdix AI share a common firmware base.
Due to hardware differences, not all features are avail...
On The Edge
Launched in June 1983, Orca Industries Inc.’s Electronic Dive Guide (EDGE)—the first true microprocessor-based dive computer1 introduced the concept of multi-level diving, and in doing so helped revolutionize sport diving.
