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Lesson 5: Navigation InstrumentsPowerPoint Presentation

Lesson 5: Navigation Instruments

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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.

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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

- Manual method of determining depth
- Also allows for a sampling of the bottom type

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

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.

Bearing Circle/Alidade

- Azimuth or Bearing Circle
- Telescopic Alidade

Bearing Circle

- Telescopic Alidade

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.

Used for distance (range) only!!

Not normally used for bearings

Making an Observation with the Stadimeter

- Distance is determined by:
- distance = height of object / tan (angle)

Plotting Instruments

Parallel Ruler

Plotting Instruments

Parallel Plotter

Plotting Instruments

Parallel Motion Protractor

Plotting Instruments

- Compass
- Dividers

Plotting Instruments

Nautical Slide Rule

Operation of Nautical slide Rule

- Given two of the following, find the third:
- Speed
- Distance
- Time

Measurement of Speed

- Speed over Ground (SOG) = true speed
- Speed through the water

SPEED THROUGH WATER

- Impeller Log
- Pitotmeter Log
- Doppler Speed Log
- Shaft RPM

SPEED OVER GROUND

- Direct output of many electronic navigation systems (GPS, Loran)

Measurement of Speed

Impeller Log

Measurement of Speed

Pitometer (Pit) Log

Measurement of Speed

Doppler Speed Log

3 Minute Rule

- The Distance in yards that a ship travels in 3 minutes (D) is equal to the Ship’s Speed (Spd) in knots multiplied by 100.
D = Spd x 100

10

D =

6 Minute Rule- The Distance in nautical miles that a ship travels in 6 minutes (D) is equal to the Ship’s Speed (Spd) in knots divided by 10.

REVIEW

- What does a fathometer measure?
- What does D=Speed x 100 tell you?

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