Question

The following device used to determine the vessel speed at sea is

• A. Compass
• B. Log
• C. GPS
• D. Sextant

Hint:

The unit of speed at sea, the "knot" (one nautical mile per hour), is derived directly from the traditional "chip log" method, where sailors counted the number of knots on the rope that rolled out in a specific timeframe.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Navigational instruments are used aboard fishing vessels to determine position, direction, speed, and depth for safe passage and effective fishing operations.

Step 2: Detailed Explanation:
- Log: The marine instrument specifically designed to measure a vessel's speed through the water and calculate the distance traveled.
Historically, a "chip log" (wooden board on a knotted line) was thrown overboard; today, modern electronic/electromagnetic logs are used.
- Compass: Measures direction (bearing).
- Sextant: Measures the angle between a celestial body and the horizon to determine latitude.

Step 3: Final Answer:
The device used to determine speed is the Log, which corresponds to option (B).