The diver gains academic knowledge and skills to enable the:
- Use of decompression software and dive computers to plan and make decompression dives with no more than 10 minutes of total decompression and not deeper than 40 meters/130 feet.
- Use of a single cylinder of decompression gas with up to 50 percent oxygen (EANx50) to add conservatism to the required decompression.
Tec 40 expands the range of gases available for most Enriched Air Divers from 40% to 50% oxygen content for conservatism during decompression. All dives are planned and executed as if the diver is breathing from back gas for duration of the dive making a single gas switch during decompression. The diver will omit any "accelerated decompression" achieved by switching to a gas with increased oxygen content.
Selecting a Gear Configuration:
Tec 40 allows a range of acceptable gear configurations from simply attaching small cylinders to a recreational BCD through more traditional technical configurations, i.e. back mounted doubles or sidemount. Four acceptable configurations are pictured below - all appropriate for Tec 40. It is wise to consider acceptable configurations for Tec 45/50 when making a selection for Tec 40 as more in-water experience in a specific configuration benefits future training.
The 3-cylinder diagram shows a diver with a single tank and standard valve. This configuration requires a second (smaller) cylinder of back gas to achieve redundant source of back gas and a third (smaller) cylinder is used for decompression gas. The H-valve diagram shows a diver with a single tank for back gas with an H-valve which allows the use of two independent first & second stage regulators providing a redundant method of acquiring back gas with a single decompression cylinder. The doubles diagram shows a diver with back-mounted doubles with independent first and second stage regulators for back gas and a single decompression cylinder. The sidemount diagram shows a sidemount configuration featuring independent cylinders, first and second stage regulators, and a single decompression cylinder.