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NAVIGATION TRAINING Section 6 Navigational Aids

NAVIGATION TRAINING Section 6 Navigational Aids . 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

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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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