PRODUCT NAME : SPERRY MARINE DOPPLER SPEED LOG ELECTRONIC U
COMPANY NAME : SPERRY
MODEL NUMBER : 4909

PRODUCT DESCRIPTION :

The Sperry Marine Doppler Speed Log Electronic U (often referred to as a Doppler Speed Log) is a marine navigation instrument designed to measure a vessel’s speed through water using the Doppler shift principle. Sperry Marine is a well-established manufacturer of marine electronics, and their Doppler Speed Log systems are known for providing accurate and reliable speed measurements, which are essential for safe navigation and operational efficiency.

The Doppler Speed Log system works by emitting a high-frequency signal (typically ultrasonic) towards the water and measuring the shift in frequency of the returned signal, which is proportional to the velocity of the water relative to the vessel. This principle, known as the Doppler Effect, allows the system to calculate the vessel’s speed through water independently of external factors like current or wind, making it a valuable tool in various maritime applications.