Intro to Tech TDI

Theory:

• Physics
  • Pressure check
• Physiology
  • Ascent / Descent rates.
  • Hyperthermia.
  • Hypothermia.
  • Psychological aspects.
• Equipment Considerations
  • Single or double cylinder(s); valve options.
  • Regulator options.
  • Harness/BCD options.
  • Spool/reel options.
  • Lift bag/surface marker bag options.
  • Exposure protection options.
  • Minimal equipment, carry only what is necessary.
  • Lining and stowage of equipment
• Dive Planning
  • Planning and execution of dives with tables/computer.
  • Surface air consumption rate (SAC) calculations.
  • Minimum gas reserve calculations for no-decompression dives.
  • Environmental considerations
• Procedures
  • Entry/exit strategies.
  • Emergency strategies in case of gas failure/loss.
  • Ascent/descent strategies.

Land drills:

• Selection and preparation of equipment.
• Performing team-oriented skills (buddy checks) for deployment of lift bags.
• Comparison of gases among peer teams
• Demonstrate familiarity with basic hand signals.
• Demonstrate adequate pre-dive planning, with limits based on gas consumption of equipment and personnel.

Water skills:

• Demonstrate various propulsion techniques: frog kick, modified frog kick, modified flutter kick, backward kick, helicopter spins, and manual traction if appropriate for the environment.
• Demonstrate adequate buoyancy control; ability to remain in a fixed position in the water column without moving hands or feet.
• Demonstrate proper fit; ability to maintain correct position during descent, bottom and ascent of the dive.
• Unhook and hook on the side-mounted bottles.
• Demonstrate the ability to perform the following exercises while maintaining balance and buoyancy in the water column:
  • Unhook and hook on the side-mounted bottles.
  • Perform gas changes with and without mask.