What are the gridlines? Mention any three rules of Grid Reference.

1.	What are the gridlines? Mention any three rules of Grid Reference.
Answer» A map is covered with a network of purple lines, some running North and South and others West and East. These form a series of small squares all over the map.These lines are known as Grid Lines. Rules of Grid Reference i. A reference must always contain a even number of figures. Normally it contains six figures. ii. Always count along the EASTING lines first from the WEST to EAST and then from SOUTH to NORTH along NORTHINGS. iii. For six figure Grid Reference the third and the sixth figure represent the divisions of 1000 meters square to the nearest 10th part, so they have to be estimated and for these figures a slight latitude is allowed. iv. 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 its identity and four figure grid reference would suffice.

Answer»

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

Rules of Grid Reference

i. A reference must always contain a even number of figures. Normally it contains six figures.

ii. Always count along the EASTING lines first from the WEST to EAST and then from SOUTH to NORTH along NORTHINGS.

iii. For six figure Grid Reference the third and the sixth figure represent the divisions of 1000 meters square to the nearest 10th part, so they have to be estimated and for these figures a slight latitude is allowed.

iv. 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 its identity and four figure grid reference would suffice.

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