Speed Log, Speedlog, Knot Meter, and Marine Electronics
The speed log—often referred to as a knot meter—is a vital navigation tool used to measure a vessel's speed through water. From early maritime roots using log-lines and sandglasses, today's systems employ advanced electronics and Doppler technology for accurate readings essential to voyage planning and monitoring.
History and Innovation
Originally described in William Bourne's 1574 "A Regiment for the Sea," early logs involved knots tied in rope lines tossed overboard. As navigation evolved, so did the technology—from manual readings to electromagnetic and Doppler speed logs. Today’s systems feature digital displays, integration with GPS and AIS, and networkable outputs for centralized marine data systems.
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Explore Speed Log Options
For more speed log systems, visit the Speed Log Category Page.
