1. What is the SAC Buddy Equation?

The SAC (Surface Air Consumption) Buddy equation calculates a dive buddy's air consumption rate during a dive. It helps divers understand their buddy's breathing patterns and plan dives accordingly for better safety and air management.

2. How Does the Calculator Work?

The calculator uses the SAC Buddy equation:

Where:

• \( P1 \) — Starting tank pressure (psi)
• \( P2 \) — Ending tank pressure (psi)
• \( T \) — Time duration (minutes)
• \( ATA \) — Atmospheres Absolute at dive depth

Explanation: The equation calculates the surface equivalent air consumption rate by accounting for the pressure difference over time and adjusting for depth pressure.

3. Importance of SAC Calculation

Details: Understanding your buddy's SAC rate is crucial for dive planning, ensuring both divers have sufficient air for the planned dive profile, and managing emergency situations effectively.

4. Using the Calculator

Tips: Enter starting and ending pressure in psi, time in minutes, and ATA value. All values must be valid (pressures > 0, time > 0, ATA ≥ 1).

5. Frequently Asked Questions (FAQ)

Q1: What is a typical SAC rate for divers?
A: Typical SAC rates range from 0.4 to 1.0 cfm, but can vary based on experience, physical condition, and dive conditions.

Q2: How does depth affect SAC rate?
A: The ATA factor accounts for depth - air consumption increases with depth due to higher pressure and density of air.

Q3: When should SAC be measured?
A: Measure during normal swimming conditions at a constant depth for most accurate results, avoiding periods of high exertion.

Q4: Are there limitations to this calculation?
A: The calculation assumes consistent breathing patterns and doesn't account for variations in exertion, stress, or equipment differences.

Q5: How can SAC rate be improved?
A: Through regular diving practice, proper buoyancy control, relaxation techniques, and maintaining good physical fitness.