During the attack, how often is the chemical survey performed per foot below the waterline?

During the attack, how often is the chemical survey performed per foot below the waterline?

• A. .333 times per foot
• B. .444 times per foot
• C. 1 time per foot
• D. .5 times per foot

Answer: (B)

During an attack, the chemical survey is performed at fixed intervals along the hull below the waterline. The standard interval is 2.25 feet per survey, so you cover 1 survey for every 2.25 feet of hull. That gives a frequency of 1 / 2.25 = 0.444 surveys per foot. So about 0.444 times per foot is the right rate. If you scanned every 3 feet, you’d get about 0.333 per foot; every foot would be 1 per foot; every 2 feet would be 0.5 per foot.

During an attack, the chemical survey is performed at fixed intervals along the hull below the waterline. The standard interval is 2.25 feet per survey, so you cover 1 survey for every 2.25 feet of hull. That gives a frequency of 1 / 2.25 = 0.444 surveys per foot. So about 0.444 times per foot is the right rate.

If you scanned every 3 feet, you’d get about 0.333 per foot; every foot would be 1 per foot; every 2 feet would be 0.5 per foot.