If you dive between 300-1000 feet, at what depth should you begin to make corrections?

When diving at depths between 300 and 1000 feet, it is crucial to begin making corrections due to the effects of pressure and the behavior of inert gases in your body, particularly nitrogen. At about 145 feet, you are approaching the depth where changes in your body's physiology and the solubility of gases become significant. This depth is where you may start to notice symptoms related to narcosis, and it's advisable to closely monitor your ascent rate and breathing gas composition.

Diving deeper increases the partial pressures of gases, which can lead to nitrogen narcosis and potentially dangerous situations if not managed correctly. The depth of 145 feet serves as a practical reference point for divers; it's critical to start paying attention to decompression schedules and to make gradual ascent corrections to prevent decompression sickness.

Starting corrections at this depth aligns with established guidelines in technical diving and helps ensure safety during the ascent as divers need to allow sufficient time at shallower depths to safely off-gas excess nitrogen. Thus, the recommendation to begin making corrections at 145 feet is based on preventing complications and managing the physiological effects of deep diving effectively.