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GRID REFERENCE GR IN NCC

 GRID REFERENCE GR IN NCC

Sometimes it is necessary to be even more accurate. In this case you can imagine that each grid is divided into 100 tiny squares. The distance between one grid line and the next is divided into tenths.

  1. First, find the four-figure grid reference but leave a space after the first two digits.
  2. Estimate or measure how many tenths across the grid square your symbol lies. Write this number after the first two digits.
  3. Next, estimate how many tenths up the grid square your symbol lies. Write this number after the last two digits.
  4. You now have a six figure grid reference. In this instance, the tourist information office is located at 476334.

Define grid line? 

A map is covered with a net work of purple lines, some running North and South and other West and East. These form a series of small squares all over the map. These lines are known as 'Grid Lines'. 

What are the basic rules for giving grid reference?

 (a) A reference must always contain an even number of figures. In the normal method, it will contain six figures.
 (b) Always count along the EASTING lines first from WEST to EAST and then from SOUTH to NORTH, along NORTHINGS.
 (c) For the six figures reference, the third and the sixth figure represent the divisions of 1000 yards square to the nearest 10th part, so they have to be estimated and for these figures slight latitude is allowed. 
(d) If a general grid reference is to be given or there is only one such object in one square e.g. bridge, temple, road, junction, then a four figure grid reference would suffice. 


What are various types of North? 

(a) True North - The direction of North pole from the observer.
 (b) Magnetic North- It is the point to which an accurate compass needle points, when freely suspended. (c) Grid North - It is the direction to which the North South grid lines on a map point. 

Define various types of bearings?

(a) Bearing - The clock wise angle formed by a straight line joining two points and direction of NORTH, is called the bearing between the two points. A bearing is always measured clockwise. 3
 (b) Grid Bearing. Measured on the map from the Grid North by the help of a protractor. 
(c) Magnetic Bearing. Measured from Magnetic North by the compass.
(d) True Bearing. Calculated by finding out the relation of true NORTH and Grid NORTH or Magnetic NORTH.

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