UTD Books and Manuals Preview of Student & Diver Procedures Manual v2.0 | Page 12

• Adjust dive parameters on the fly based on in-water gas consumption, actual average depth, and ascent profiles or decompression strategy • Assist navigation • Adjust the dive parameters as needed

Ascents Depending on the environment, we will determine the final shape of the ascent profile. Here is a general set of rules to help get started. In any ascent, the last stop should be conducted at 20’/6m, followed by a slow ascent of 3ft/1m per minute to the surface – we call this a 5-minute ascent drill in the UTD Essentials classes. Recreational Minimum Deco Ascent Profile Overview • Calculate 50% of the average depth of the dive or your current depth, whichever is deeper. • Ascend at 30’/10m per minute to the calculated depth from above. • Conduct a one minute stop for each remaining 10’/3m interval including the ascent to the following stop. • This can be conducted as a 40 second stop and 20 seconds of movement to the next shallower interval. • Continue until you reach the next strategy or the surface. • This is based on a one-hour surface interval. If the surface interval is less than one hour, double the three shallow stops, 2 ATA to the surface, or 30’/9m, 20’/6m, 10’3m. Extended Decompression Dives (longer than 15 min bottom time) • Calculate 75% of the average depth of the dive or your current depth, whichever is deeper. • Ascend at 30’/10m per minute to the calculated depth. • Conduct a one (1) minute stop for each remaining 10’/3m interval including the ascent to the following stop. • This can be conducted as a 40 second stop and 20 seconds of movement to the next shallower interval. • Continue until you reach the next strategy.
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UTD Student and Diver Procedures Manual