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This illustration shows how the Imperial Japanese Navy used the measurement of the angle subtended by a ship to estimate the ship's angle on the bow. The target course was the most difficult piece of target data to obtain. In many cases, instead of measuring target course many systems measured a related quantity called angle on the bow. Angle ...
The course is to be distinguished from the heading, which is the direction where the watercraft's bow or the aircraft's nose is pointed. [1] [2] [3] [page needed] The path that a vessel follows is called a track or, in the case of aircraft, ground track (also known as course made good or course over the ground). [1] The intended track is a route.
True course is 120°, the Variation is 5° East and the Deviation is 1° East. T: 120° V: −5° M: 115° D: −1° C: 114° True course is 035°, the Variation is 4° West and the Deviation is 1° East. T: 035° V: +4° M: 039° D: −1° C: 038° True course is 306°, the Variation is 4° East and the Deviation is 11° West. T: 306° V: −4 ...
The Williamson turn is an alternative manoeuvre used to bring a ship or boat under power back to a point it previously passed through, often for the purpose of recovering a casualty at sea. [ 1 ] [ 3 ] It was named for John Williamson, USNR , who used it in 1943 to recover a man who had fallen overboard.
One can also use the 1 in 60 rule to approximate distance from a VOR, by flying 90 degrees to a radial and timing how long it takes to fly 10 degrees (the limit of the course deviation indicator). The time in seconds divided by 10 is roughly equal to the time in minutes from the station, at the current ground speed.
The Course Made Good is the direction in which a ship or vessel has traveled with the effects of current, wind, and helmsmanship. If a current is flowing in the same direction as the ships heading, then the Course Made Good remains the same, but the current speed and ship speed are added together.
Different modelling and design criteria will affect the nature of the 'ideal' RAO curves (as plotted graphically) being sought for a particular ship: for example, an ocean cruise liner will have a considerable emphasis placed upon minimizing accelerations to ensure the comfort of the passengers, while the stability concerns for a naval warship will be concentrated upon making the ship an ...
In modern times, computer software can greatly simplify the passage planning process and ensure that nothing important is overlooked. [8] Passage planning software may include functions such as waypoint management, distance calculators, tide and tidal current predictors, celestial navigational calculators, consumables estimators for fuel, oil, water, and stores, and other useful applications.