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NS100
Navigation Instruments
Fundamentals of
Naval Science
Measurement of Direction Azimuth Circle
Measurement of Direction Telescopic Alidade
Shooting a Bearing• Look through the rear sight slot• Line up forward wire with center of slot and
object• Look into prism to obtain bearing (true or
relative)• Record bearing for plotting.
Measurement of Distance Radar
Measurement of Distance Stadimeter - very accurate under 2000 yards
Measurement of Speed Terms:
Speed over Ground - “True” speed, or speed relative to the earth.
Speed through the water - Relative speed between the water and the ship, not accounting for the effect of current or seas.
Measurement of Speed Impeller Log
Measurement of Speed Pit Log
Dynamic pressure
static pressure
Measurement of Speed
Doppler Speed Log – can be extremely accurate
Shaft RPM vs. speed
Measurement of Depth
Fathometer
Piloting Instruments
•Divider and Drawing Compass •Parallel Ruler/Parallel Plotter/Parallel Motion Protractor (PMP) •Three-Arm Protractor