When should you activate your dive computer to ensure it is functioning correctly?

Activating your dive computer just before the dive is important for several reasons. First, this practice ensures that the computer can accurately record pre-dive parameters, such as surface interval time and current atmospheric pressure. These factors are crucial for calculating the proper no-decompression limits and ensuring that the dive plan adheres to safe diving practices.

Additionally, activating the dive computer beforehand allows it to calibrate itself based on these pre-dive conditions. This is particularly relevant for dive computers that incorporate features related to altitude changes or that adjust algorithms based on temperature or other environmental factors.

Doing this step also helps divers review their settings and ensure they are adjusted correctly for the specific dive they are about to undertake. It provides an opportunity to confirm that the dive computer is operational and that all displays are functioning properly, enhancing safety throughout the dive.

Activating the computer at other times, such as at the end of the dive or during safety stops, would not provide this critical information upfront and could lead to inaccuracies in the dive profile.