Title: How to Use Map Scales and Grids
Headings: How to Use Map Scales and Grids
How to Use Map Scales and Grids
Understanding map scales and grids is key to making full use of your map
Map Scales
Map Grids
Discovery Series Map Grid
Four-figure grid references
Watch the 3 other videos in this set.

Content: Locate the grid line immediately below the point, read the large figures labelling the line either on the top or bottom of the margin of the map. Then estimate in tenths from grid line to point. Grid line 91 estimation 8. Northing 918. Sample reference T 032 918 For local reference, letter may be omitted. A Discovery series map will also give you centre of sheet coordinates in Irish Transverse Mercator (ITM) which is a newly derived GPS compatible mapping projection that is associated with the European Terrestrial Reference System 1989 (ETRS89). Four-figure grid references
As we already said, when giving a four-figure grid reference, always give the eastings number first and the northings number second. An easy way to remember this is to keep in mind the letters HV ( H igh V oltage), that is horizontal reading first followed the vertical reading. In the diagram below, the number 4 is in square 28 across (on the horizontal) and square 54 up (on the vertical) and therefore, the four-figure grid reference is ‘2854’. The other numbers in the squares above would get the following grid reference.