Which tool is used to solve time, distance, and speed problems in navigation?

Which tool is used to solve time, distance, and speed problems in navigation?

• A. Sextant
• B. Slide Rules
• C. Protractor
• D. Chronometer

Answer: (B)

Solving time–distance–speed problems relies on basic arithmetic relationships: distance = speed × time, speed = distance ÷ time, and time = distance ÷ speed. A slide rule is a classic calculating tool designed for rapid multiplication and division, making it ideal for working through these exact relationships at sea. By aligning the scales, you can quickly compute how far you’ll travel in a given time, how long a voyage takes at a certain speed, or what speed you need to cover a distance in a target time. The other tools have different purposes: a sextant measures angles to fix position, a protractor also measures angles, and a chronometer provides precise timekeeping for navigation but doesn’t perform the arithmetic itself. The slide rule directly handles the math needed for time, distance, and speed calculations.

Solving time–distance–speed problems relies on basic arithmetic relationships: distance = speed × time, speed = distance ÷ time, and time = distance ÷ speed. A slide rule is a classic calculating tool designed for rapid multiplication and division, making it ideal for working through these exact relationships at sea. By aligning the scales, you can quickly compute how far you’ll travel in a given time, how long a voyage takes at a certain speed, or what speed you need to cover a distance in a target time.

The other tools have different purposes: a sextant measures angles to fix position, a protractor also measures angles, and a chronometer provides precise timekeeping for navigation but doesn’t perform the arithmetic itself. The slide rule directly handles the math needed for time, distance, and speed calculations.