t nav chpt 5 fall 2012 - Chapter 5 Dead Reckoning Bearings...

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Chapter 5 – Dead Reckoning, Bearings, and Fixes Fix: definite determination of the ship’s position May be obtained by: o Star fix (using a sextant to measure the angular altitude above the horizon of two or more stars and then calculating the ship’s position using those altitudes, the Nautical Almanac, and the Sight Reduction Table) o Radar fix (fix based on radar range and bearing off one or more charted objects) o GPS fix (based on the readouts on the ship’s GPS receiver that receives signals from the GPS satellites) o Loran fix (based on the readouts of the ship’s Loran receiver, that receives signals from shore-based Loran stations) o When within sight of land, when it’s possible to take bearings on lighthouse, headlands, buoys, etc., the navigator can get a fix by taking simultaneous bearings on two or more such objects Indicate all fixes by drawing a circle around the point of the fix Time, Speed, and Distance Speed (time) = distance Distance/time = speed Distance/speed = time Time must be in hours and decimals of an hour, distance must be in nautical miles, and decimals of a nautical mile Speed must be in knots and decimals of a knot The Time, Speed, and Distance Table Every merchant ship has posted near her chart table a time, speed, and distance table that can be used instead of doing the equations Speed by Engines and Slip
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