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# Lesson 8 - Navigation and time

## by Guilherme Azevedo, Working at Brazilian Navy on Jun 24, 2007

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## Lesson 8 - Navigation and timePresentation Transcript

• NS100 Introduction to Navigation and Time
• Objectives
• 1. Understand the terrestrial coordinate system as used to determine position on the surface of the earth.
• Understand the concepts of latitude and longitude, and how distances and direction on the surface of the earth are computed.
• Understand time and time zones in navigation.
• Reference Points and Lines Axis Poles Great Circles Equator Meridians Small circles
• Reference Points
• Prime Meridian
• Equator North Pole South Pole Longitude line Latitude line
• Coordinate System Position - L atitude and Longitude Example: Degrees o Minutes’ Seconds” 39 o 58’ 55” N 075 o 28’ 45” W
• Rhumb Lines & Great Circles Rhumb line Great Circle
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• Time
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• 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
• +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
• Time Definitions Daylight Savings Time – SPRING AHEAD , FALL BACK +5 becomes… +4 -9 becomes… -10
• International Date Line Used as a convenience. “ If its SUN day in SAN Francisco, it’s MON day in MAN illa”
•
• 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
• 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