Question

How to find four-figure and six-figure grid reference?

Answer 1

Four-figure grid reference: Square grid or four-figure grid reference e.g., the four figure grid reference of A in the figure is 6218. It means that A lies between Eastings 62 to 63 and Northings 18 to 19.

Six-figure grid reference: The six figure grid reference gives the exact location of a feature. For example, the six figure grid reference of A would be 623188. The first three digits gives the Eastings and the next three digits, the Northings. To get the third digit in the Eastings one has to mentally divide the space between 62 to 63 into 10 equal parts.
Thus, the third digits comes to 3. Similarly to get the sixth digit, mentally divide the space between 18 to 19 into 10 equal parts. Thus, the sixth digit comes to 8. The six-figure grid reference of A is 623188.
The grid squares on the toposheets are generally of 1 sq km..
Sometimes there are squares in which are written QC and QD. These denote two lettered number of 100 square km.