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NAVIGATION TRAINING Section 6 Navigational Aids

Learn about different navigational aids such as lighthouses, buoys, and beacons, and how to identify them during day and night. Explore the significance of navigational aids in safe navigation.

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NAVIGATION TRAINING Section 6 Navigational Aids

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  1. NAVIGATION TRAINING Section 6 Navigational Aids

  2. Table of Contents • • Section 1 Types of Navigation • • Section 2 Terrestial Coordinates • • Section 3 Charts • • Section 4 Compass • • Section 5 Nautical Publications • • Section 6 Navigational Aids • • Section 7 Buoyage • • Section 8 Position Lines and Fixes • • Section 9 Tides • • Section 10 Currents • • Section 11 Weather

  3. Navigational Aids Significance of Navigational Aids •Navigational Aid: Any device external to a vessel or aircraft intended to assist in determining position and safe course, or to warn of dangers or obstructions.

  4. Navigational Aids Navigational Aids Navigational aids will include: Lighthouses Transit Marks Leading Lines Buoyage Beacons & Day Marks Identifiable charted object

  5. Navigational Aids Positive Identification of Navigation Aids DAYTIME NIGHT •Location •Shape •Colour Scheme •Auxiliary features •Special Markings •Phase characteristic •Period & Colour

  6. Navigational Aids Positive Identification of Navigation Aids (at night)

  7. Navigational Aids Positive Identification of Navigation Aids (at night) Period = Length in seconds of repetition Colour= (red, green, yellow, or white)

  8. Navigational Aids

  9. Navigational Aids Special Purpose Lights • Sector Lights • Red light used in dangerous sectors • Sector limits are expressed in degrees true as observed from a vessel, not from the light!

  10. Navigational Aids Other Navigational Aids Other navigational aids, providing they are charted, will include:

  11. Navigational Aids Navigation Marks and Buoyage

  12. Navigational Aids Determining the Computed Visibility of a NavAid Horizon distance = the line of sight from a position above the earth’s surface to the visual horizon. Geographic range = the maximum distance that a light may be seen in perfect visibility by an observer’s eye who is at sea level Bella Bella

  13. Navigational Aids Determining the Computed Visibility of a NavAid Computed range = the distance at which a light could be seen in perfect visibility (taking into account elevation, observer’s height of eye, and the curvature of the earth). Computed Range = Horizon Distance + Geographic Distance Bella Bella

  14. Navigational Aids Determining the Computed Visibility of a NavAid Computed range = the distance at which a light could be seen in perfect visibility (taking into account elevation, observer’s height of eye, and the curvature of the earth). Computed Range = Horizon Distance + Geographic Distance

  15. Navigational Aids Determining the Computed Visibility of a NavAid Computed visibility = The maximum distance at which a light can be seen in the current meteorological conditions. Luminous range = the maximum distance at which a light may be seen under under the current meteorological conditions. Nominal range = a special case of the luminous range. It is the distance a light could be seen in “clear” weather. Also called the charted range.

  16. Navigational Aids

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