Coordinate Reference System

A Coordinate Reference System is a method of projecting positions from the curved surface of the Earth to a flat screen or paper.

SIS Desktop allows you a choice of CRS to work better with various maps.

• If you are working on UK data, the default CRS is most likely to be OSGB 1936.British National Grid.
• If you are using Ordnance Survey data, the map defaults to OSGB 1936.British National Grid.

Use the Units tab to change the default display method for the units on screen.

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