Presentation on theme: "GRID REFERENCES MADE EASY"— Presentation transcript:
1 GRID REFERENCES MADE EASY Produced by David Morris
2 A GRID REFERENCE is a number which gives a location on a map They are very useful in Scouts when we’re out hikingWe can use them to find out where we’re supposed to be…...or if we get lost we can tell someone where we are
3 216409 The grid references we usually use are SIX FIGURE references They will look something like this:216409A bit like a phone number
4 These numbers refer to the GRID which covers all maps Here they’re marked in PINK so you can see them, but they’re usually BLUE
5 20212223404142The grid is labelled with GRID NUMBERS at the bottom and left sides of the map
6 The numbers at the bottom are called EASTING because they show how far East you are. They label these lines…20212223
7 42The numbers at the side are called NORTHINGS because they show how far North you are . They label these lines…4140
8 Each Easting refers to the column to the right of it’s grid line 21
9 Each Northing refers to the row above it’s grid line 40
10 Where are these EASTINGS and NORTHINGS in the Grid Reference? 2164092140EASTINGNORTHING
11 40 21 Both numbers combined give a square on the map... The grid reference of this square is 21 404021
12 EASTINGS FIRST How do you remember WHICH COMES FIRST though? One way of remembering is to read the numbers ALONG the bottom (EASTINGS) and then those UP the side (NORTHINGS) because you go ALONG the hallway in a house before going UP the stairs
13 EXERCISE ONE FIND THE SQUARE You’ll have a map between two, and a list of 6 figure grid references - just find the big square for each one
14 But what about these ones? OK so we now know how to find the square from these numbers:216409216940But what about these ones?What are they for?
15 Well the 40 and 21 only give you a big square one kilometre wide! Not much use if you need to know where to go exactly!1km4021
16 So we split each square into 100 smaller squares...
17 Each square is labelled like the grid before, but with just one number from 0 to 9 987654321
18 So, same as before, a square is identified by an EASTING and a NORTHING Remember, EASTING first987654321So what’s the two numbers which identify this square?
19 That’s right: 4 and then 74 first as it’s the EASTING987654321