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.