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Doppler Velocity Log (DVL): Some ships are equipped with sonar instruments that can measure the Doppler shift in a sound pulse generated by the ship's motion as it reflects off the ocean bottom or off particles in the water.
Doppler velocity log (DVL) For underwater vehicles, the bottom tracking feature can be used as an important component in the navigation systems. In this case the velocity of the vehicle is combined with an initial position fix, compass or gyro heading, and data from the acceleration sensor.
Chip log A chip log, also called common log, [1] ship log, or just log, is a navigation tool mariners use to estimate the speed of a vessel through water. The word knot, to mean nautical mile per hour, derives from this measurement method.
^ abChanson, H. (2008). "Acoustic Doppler Velocimetry (ADV) in the Field and in Laboratory: Practical Experiences" (PDF). In Frédérique Larrarte; Hubert Chanson (eds.). Experiences and Challenges in Sewers: Measurements and Hydrodynamics, Hydraulic Model Report No. CH70/08. The University of Queensland, Division of Civil Engineering. pp. 49–66. ISBN 978-1-86499-928-0.
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This page was last edited on 11 April 2014, at 17:40 (UTC).
Dead reckoning. The navigator plots their 9 a.m. position, indicated by the triangle, and, using their course and speed, estimates their own position at 9:30 and 10 a.m. In navigation, dead reckoning is the process of calculating the current position of a moving object by using a previously determined position, or fix, and incorporating ...
Sentry navigates by means of a doppler velocity log combined with an inertial navigation system. These are used in conjunction with a USBL, or LBL, acoustic navigation system which is also used to communicate with the vessel—providing it with commands as well as receiving the data from the sensors and onboard equipment.