Headlog
A headlog is a device used on ships to measure the speed and distance traveled through water. It consists of a rotor that is placed in the water and connected to a mechanical or electronic sensor that measures the rotation of the rotor. The speed and distance traveled through water can be calculated based on the rotation of the rotor. Headlogs are important for navigation and safety, as they provide accurate information about the ship's speed and position relative to the water. They are commonly used on all types of ships, from small pleasure boats to large commercial vessels.
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