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Lesson 8 - Navigation and time

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Lesson 8 - Navigation and time

  1. 1. NS100 Introduction to Navigation and Time
  2. 2. Objectives <ul><li>1. Understand the terrestrial coordinate system as used to determine position on the surface of the earth. </li></ul><ul><li>Understand the concepts of latitude and longitude, and how distances and direction on the surface of the earth are computed. </li></ul><ul><li>Understand time and time zones in navigation. </li></ul>
  3. 3. Reference Points and Lines Axis Poles Great Circles Equator Meridians Small circles
  4. 4. Reference Points
  5. 5. Prime Meridian
  6. 6. Equator North Pole South Pole Longitude line Latitude line
  7. 7. Coordinate System Position - L atitude and Longitude Example: Degrees o Minutes’ Seconds” 39 o 58’ 55” N 075 o 28’ 45” W
  8. 8. Rhumb Lines & Great Circles Rhumb line Great Circle
  9. 10. Time
  10. 16. Equator - - - - - - - - - - - X W V U T S R Q P O N Z A B C D E F G H I K L 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 + + + + + + + + + + + +12 Y -12 M
  11. 17. +12 +11 +10 +9 +8 +7 +6 +5 +4 +3 +2 +1 0 -1 -2 -3 - 4 -5 -6 -7 -8 -9 -10 -11 -12 Y X W V U T S R Q P O N Z A B C D E F G H I K L M
  12. 18. Time Definitions Daylight Savings Time – SPRING AHEAD , FALL BACK +5 becomes… +4 -9 becomes… -10
  13. 19. International Date Line Used as a convenience. “ If its SUN day in SAN Francisco, it’s MON day in MAN illa”
  14. 21. Date Time Group Format Date Time Group (DTG) - This format is used on virtually all military message traffic. The format is as follows: DDTTTT Z MONYR 241300ZJAN04
  15. 22. Arc to Time Conversions ARC TIME 15 deg 1 hr 1 deg 4 min (1 deg =60’) 60’ 240 sec (1min=60sec) 1’ 4 sec

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