Lesson 5: Navigation Instruments. Lesson 5: Navigation Instruments. AGENDA: Measurement of Depth Measurement of Direction Measurement of Distance Measurement of Speed Applicable reading: Hobbs pg. 110-128. Measurement of Depth. Echo Sounder (fathometer) Hand leadline. Lead Line.
270T / 180R
090T / 000R
180T / 090R
Visual Bearings can be measured in:
- Degrees Relative ( # # # 0R )
- Degrees Magnetic ( # # # pstgc OR 0M )
- Degrees True ( # # # 0T)
The navigator must convert any of these types of bearings to True before they can be plotted on the chart.
Radar-Distance is obtained by a radio wave
that is transmitted into the air and returns as
an echo. The time
return can be
a physical range.
Used for distance (range) only!!
Not normally used for bearings
Used to determine precise ranges between ships in formation
Parallel Motion Protractor
Nautical Slide Rule
SPEED THROUGH WATER
SPEED OVER GROUND
Pitometer (Pit) Log
Doppler Speed Log
D = Spd x 100
D =6 Minute Rule