Download
1 / 37
390 likes | 647 Views
GRID REFERENCES MADE EASY. 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!.
E N D
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!
The grid references we usually use are SIX FIGURE references They will look something like this: 216409 A bit like a phone number!
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
42 41 40 20 23 21 22 The grid is labelled with GRID NUMBERS at the bottom and left sides of the map
The numbers at the bottom are called NORTHINGS because the label grid lines which go NORTH 23 21 22
42 The numbers at the bottom are called EASTINGS because the label grid lines which go EAST 41 40
Each Northing refers to the column to the right of it’s grid line 21
EASTING NORTHING Where are these NORTHINGS and EASTINGS in the Grid Reference? 216409 40 21
Both numbers combined give a square on the map... The grid reference of this square is 21 40 21
How do you remember WHICH COMES FIRST though? Well, just remember NORTHINGS FIRST …and that NORTHINGS are the numbers along the bottom, labelling the lines that go NORTH!
GRID REFERENCESMADE EASY 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
6 9 OK so we now know how to find the square from these numbers: 216409 40 21 But what about these ones? What are they for?
1km 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! 40 21
9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9 Each square is labelled like the grid before, but with just one number from 0 to 9
So, same as before, a square is identified by a NORTHING and an EASTING Remember, NORTHING first 9 8 7 6 5 4 3 2 1 0 So what’s the two numbers which identify this square? 0 1 2 3 4 5 6 7 8 9
That’s right: 4 and then 7 4 first as it’s the NORTHING 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9
Then 7 as it’s the EASTING 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9
42 41 40 20 23 21 22 OK, let’s put it all together… See the spot height marked 375 in the square below?
42 41 40 20 23 21 22 Let’s find out it’s full 6 figure reference _ _ _ _ _ _ First, what square is it in?
42 41 40 20 23 21 22 Yes, 21 - 40! But where does this fit into the 6 figure reference?
42 41 40 20 23 21 22 2 1 _ _ _ _ 21 first
42 41 40 20 23 21 22 2 1 _ 4 0 _ Then 40
42 41 40 20 23 21 22 Both together... 2 1 _ 4 0 _
42 41 40 20 23 21 22 Now we need to look at the missing two figures: 2 1 _ 4 0 _
42 41 40 20 23 21 22 2 1 _ 4 0 _ So we add the grid - usually you do this in your mind!
42 41 40 20 23 21 22 2 1 _ 4 0 _ The spot height is in this square
9 8 7 6 5 4 3 2 1 0 2 2 0 1 2 3 4 5 6 7 8 9 Zooming in... 2 1 _ 4 0 _ 2 2
42 41 40 20 23 21 22 So now we have the full grid reference: 2 1 2 4 0 2
42 41 40 20 23 21 22 OK, what about the station in Llangollen? _ _ _ _ _ _
42 41 40 20 23 21 22 OK, what about the station in Llangollen? 214422
42 41 40 20 23 21 22 OK, where’s this one... 204408
42 41 40 20 23 21 22 OK, where’s this one... 204408 Answer: Bank Fm
GRID REFERENCESMADE EASY EXERCISE TWO PRACTISE 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
