To see grid references in real-time

 

The Grid Reference tool is located on the left-hand side of the Notification Bar at the base of the map.  It is permanently active to show you the Easting and Northing co-ordinates for the position of your cursor on the UKMap Detail layer, and the Easting and Northing co-ordinates, OS Tile Number and National Grid Reference for the position of your cursor on the VML Raster and OS Detail layer.

See also

To obtain and Easting and Northing for a point on the map