What should be used to gauge a proper ascent rate if lost on a deep dive?

Using a dive computer is the most reliable method for gauging a proper ascent rate, especially if one finds themselves uncertain on a deep dive. Dive computers are specifically designed to manage dive profiles, including tracking depth and time underwater, which are crucial for ensuring a safe ascent. They automatically calculate safe ascent rates based on the depth and duration of the dive, while also accounting for factors like saturation levels of nitrogen in the body.

This technology typically includes features such as alarms that alert divers to exceed the recommended ascent rate, usually set around 9 to 10 meters (30 to 33 feet) per minute for recreational diving. Moreover, dive computers often incorporate other critical safety information, such as no-decompression limits and residual nitrogen buildup, aiding divers in making informed decisions during ascent.

While buddy signals, depth gauges, and timing devices can also provide valuable information during a dive, they lack the integrated safety features and real-time calculations that dive computers offer. Buddy signals rely on visual communication, which can be hindered by various factors, while manual depth gauges and timers require divers to continuously monitor and adjust their ascent rate based on their own calculations, which can be prone to error under stressful conditions.