1. NAVIGATION TRAINING Section 6 Navigational Aids

2. Section 1Types 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 Table of Contents

3. 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. Significance of Navigational Aids

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

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

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

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

9. 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! Navigational Aids

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

11. Navigation Marks and Buoyage Navigational Aids

12. 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 Navigational Aids

13. 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 Navigational Aids

14. 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 Navigational Aids

15. 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. Navigational Aids