www.9thHuddersfieldScouts. www.9thHuddersfieldScouts. org.uk org.uk
Feb 25, 2016
www.9thHuddersfieldScouts.orwww.9thHuddersfieldScouts.org.ukg.uk
www.9thHuddersfieldScouts.orwww.9thHuddersfieldScouts.org.ukg.uk
GRID REFERENCESGRID REFERENCESMADE EASYMADE EASY
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GRID REFERENCES MADE EASY
A GRID REFERENCE is a number which gives a location on a map
They are very useful in Scouts when we’re out hiking
We can use them to find out where we’re supposed to be…
...or if we get lost we can tell someone where we are!
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The grid references we usually use are SIX FIGURE references
They will look something like this:
216409A bit like a phone number!
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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
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The grid is labelled with GRID NUMBERS at the bottom and left sides of the map
20 21 22 2340
41
42
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21 22 23
The numbers at the bottom are called NORTHINGS because the label grid lines which go NORTH
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The numbers at the bottom are called EASTINGS because the label grid lines which go EAST
40
41
42
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21
Each Northing refers to the column to the right of it’s grid line
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Each Easting refers to the row above it’s grid line
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Where are these NORTHINGS and EASTINGS in the Grid Reference?
21640921 40NORTHING EASTING
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Both numbers combined give a square on the map...
21
The grid reference of this square is 21 40
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How do you remember WHICH COMES FIRST though?
Well, just remember
NORTHINGS FIRSTNORTHINGS FIRST…and that NORTHINGS are the numbers along the bottom, labelling the lines that go NORTH!
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GRID REFERENCESMADE EASY
EXERCISE ONEFIND 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
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OK so we now know how to find the square from these numbers:
21640921 40But what about these ones?
6 9
What are they for?
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Well the 40 and 21 only give you a big square one kilometre wide!
4021
Not much use if you need to know where to go exactly!
1km
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So we split each square into 100 smaller squares...
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Each square is labelled like the grid before, but with just one number from 0 to 9
0 1 2 3 4 5 6 7 8 9
9876543210
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So, same as before, a square is identified by a NORTHING and an EASTINGRemember, NORTHING first
0 1 2 3 4 5 6 7 8 9
9876543210
So what’s the two numbers which identify this square?
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That’s right: 4 and then 7
4 first as it’s the NORTHING
0 1 2 3 4 5 6 7 8 9
9876543210
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Then 7 as it’s the EASTING
0 1 2 3 4 5 6 7 8 9
9876543210
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OK, let’s put it all together… See the spot height marked 375 in the square below?
20 21 22 2340
41
42
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Let’s find out it’s full 6 figure reference
_ _ _ _ _ _First, what square is it in?
20 21 22 2340
41
42
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20 21 22 2340
41
42Yes, 21 - 40!But where does this fit into the 6 figure reference?
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20 21 22 2340
41
42
2 1 _ _ _ _21 first
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20 21 22 2340
41
42
2 1 _ 4 0 _Then 40
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20 21 22 2340
41
42
Both together... 2 1 _ 4 0 _
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20 21 22 2340
41
42 Now we need to look at the missing two figures:
2 1 _ 4 0 _
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20 21 22 2340
41
422 1 _ 4 0 _So we add the grid - usually you do this in your mind!
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20 21 22 2340
41
422 1 _ 4 0 _The spot height is in this square
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Zooming in...
0 1 2 3 4 5 6 7 8 9
9
8
7
6
5
4
3
2
1
0
2 1 _ 4 0 _22
2
2
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20 21 22 2340
41
42 So now we have the full grid reference:
2 1 2 4 0 2
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20 21 22 2340
41
42
OK, what about the station in Llangollen?
_ _ _ _ _ _
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20 21 22 2340
41
42
OK, what about the station in Llangollen?
214422
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20 21 22 2340
41
42
OK, where’s this one...
204408
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20 21 22 2340
41
42
OK, where’s this one...
204408 Answer: Bank Fm
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GRID REFERENCESGRID REFERENCESMADE EASYMADE EASY
EXERCISE TWOPRACTISE MAKES PERFECT
You’ll have a map between two, challenge each other to give the grid ref for a place, and the places for given refs