7.3 Directions on an OS Map Directions on OS maps are given in the form of compass points.
N 31 22 23 24 25 1 W E 30 3 2 S
Identify the following directions on this map showing an area of Galway:
1 From Clydagh to An tÀth Buì 2 From Corcullen to Tooreeny 3 From Pollagh to Pollnaclogha
28 28 29 29 30 31
27 Key Words
National Grid Sub-zones Eastings Northings
Grid reference
Four-figure grid reference
Six-figure grid reference
22 23 24 2527 7.4 Locating Places: The
National Grid To be useful, maps have to provide a way to identify what areas they are showing in Ireland. The National Grid reference system is used to locate areas on Ordnance Survey maps. z„
On the back of an OS map you will find a small map of Ireland. The map will be divided into twenty-five lettered squares called sub- zones. (The letter I is left out so as not to confuse it with the number 1.)
Examine the grid (figure 3). Identify the location of your school and record what sub-zone/s it is found in.
