L-05_Navigation_Instruments_(1)[1]

L-05_Navigation_Instruments_(1)[1] - Lesson 5 Navigation...

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3/28/14 Lesson 5: Navigation Instruments
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Learning Objectives Use of the azimuth circle, bearing circle, alidade in the measurement of direction Use of the stadimeter in the measurement of distance Methods by which speed through the water is determined Use of lead lines and echo sounders to determine depth Basic plotting instruments and their uses
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Measurement of Direction Bearing: the horizontal direction of one terrestrial point as measured from another, expressed as an angle from 0 to 360 degrees. There are three references for bearings: Relative Magnetic True
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000T / 270R 090T / 000R 180T / 090R 270T / 180R
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Azimuth or Bearing Circle Telescopic Alidade Bearing Circle
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Measurement of Distance Radar Used for distance (range) only!! Not normally used for bearings Stadimeter Used to determine precise ranges between ships in formation
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Measurement of Distance Radar - Distance is obtained by a radio wave that is transmitted into the air and returns as an echo. The time interval between transmission and return can be converted into a physical range .
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Measurement of Distance STADIMETER
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  • Spring '14
  • Distance, Slide rule, nautical mile, Echo sounding, Stadimeter

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