MAP SETTINGS IN NCC
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.
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(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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