ACP 32 Volume 2-Navigation
air cadet publication
ACP 32
navigation volume 2 - basic navigation
CADET FO
OMBINED
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? Crown Copyright 2007
Amended by
Date Incorporated
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ACP 32 NAVIGATION
CONTENTS
Volume 1 ................. Map reading Volume 2................. Basic Navigation Volume 3 ................. Air Navigation Volume 4 ................. Pilot Navigation
Volume 2
Basic Navigation
Chapter 1 ................ Basic Navigation Chapter 2 ................ The Compass Chapter 3 ................ Practical Navigation Chapter 4 ................ Weather
ISSUED 2000
ii
iii
CHAPTER 1
BASIC NAVIGATION
BASIC NAVIGATION
What is navigation all about?
1. Good navigation is all about knowing where you are on a map, where you want to go and choosing the best route to follow in order to get there. It combines good map reading skills and good compass work.
2. Navigating is a skill that if done well can bring a great deal of personal satisfactionso practice as much as you can. On expeditions, never leave the navigation totally to others. It is always good practice to involve yourself in checking your position and route, even if you are not leading or navigating for the group. Your aim should be to know exactly where you are on the map at any time.
True North or Grid North?
The difference between true north and grid north
3. You will already have read about the National Grid being a network of lines placed over a map of the British Isles as a sort of indexing system. On any OS map the grid lines enable you to identify a small area of ground by its Grid Reference.
4. These grid lines differ from lines of latitude and longitude in that they cover a flat surface (the map) and so are regular. Lines of latitude and longitude cover the curved surface of the Earth with lines of longitude getting closer and closer together as they approach the north and south poles.
5. Because of this difference between these 2 sets of lines, grid lines do not actually point to the north pole of the Earth (True North) - instead they are said to point to an imaginary point called Grid North. The actual difference between the two norths varies depending on where in the UK you are but is normally no more than 2?.
6. In navigation you must always use Grid North as your reference, True North has no real significance as far as your map is concerned.
Setting or Orientating your map
Orientating your map by eye
7. One of the first things you must try doing when using a map is to relate the features on the map to the ground that you can see in front of you. To help you do this you must turn the map in such a way that identifiable features on the ground are in their correct position relative to the map.
32.2.1-1
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