What do you mean by eastings and northings in a topographical map ?

1.	What do you mean by eastings and northings in a topographical map ?
Answer» In a grid system of a topo sheet, the lines that run vertically across a topographical map are called eastings. They are measured eastwards from the origin of the grid. In a grid system of a topo sheet, the lines that run horizontally across a topographical map are called northings. They are measured eastwards from the origin of the grid in northerly direction.

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