position fixing การใช้

• Other symbols show the position and characteristics of buoys, lights, lighthouses, coastal and land features and structures that are useful for position fixing.
• This impressive performance, Ritchie said, is well within the required IMO criteria and " will significantly enhance accurate position fixing in restricted waters.
• A "'sector light "'is a man-made pilotage and position fixing aid that consists of strictly de-limited horizontal angle light beams to guide water-borne traffic through a safe channel at night in reasonable visibility.
• Although in the days of differential GPS this range and accuracy may appear poor, in its day the Decca system was one of the few, if not the only, position fixing system available to many mariners.
• "' Celestial navigation "', also known as "'astronavigation "', is the ancient science of position fixing that enables a navigator to transition through a space without having to rely on estimated calculations, or dead reckoning, to know their position.
• "' Leading lights "'( also known as "'range lights "'in the United States ) are a pair of light beacons, used in navigation to indicate a safe passage for vessels entering a shallow or dangerous channel; and may also be used for position fixing.
• The proposal was originally made by Jens K . Jensen from the Danish Maritime Safety Administration in 2009, in relation to the need for an independent source for position fixing, due to the vulnerabilities of GPS and other satellite navigation systems, identified during the work at IMO's e-Navigation strategy.
• The PS-3 tank gun was developed at the Experimental Engineering-Mechanical Department ( OKMO ) of the Factory No . 174 by engineer P . Syachentov . The PS-3 had better specifications in comparison with the series-produced KT tank gun and also had several technical innovations ( foot firing switch, original training gear, travelling position fixing, binocular optical sight ).