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# Grid References - PowerPoint PPT Presentation

Grid References. 18. 17. 16. 15. 14. 13. 12. 24. 25. 26. 27. 28. 29. 30. The Rules…. Read the HORIZONTAL coordinate BEFORE the VERTICAL one… ‘Along the corridor & up the stairs’ ‘The baby crawls before it walks’

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## PowerPoint Slideshow about ' Grid References' - austin-mcintyre

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Presentation Transcript

### Grid References

17

16

15

14

13

12

24

25

26

27

28

29

30

• Read the HORIZONTAL coordinate BEFORE the VERTICAL one…

‘Along the corridor & up the stairs’

‘The baby crawls before it walks’

• You read the coordinates from the BOTTOM LEFT HAND CORNER of the square you want to describe.

17

2716

16

15

14

13

12

24

25

26

27

28

29

30

18

2816

17

2615

16

2514

15

2813

14

2912

13

2513

12

24

25

26

27

28

29

30

• To be even more accurate, we can divide grid squares up into smaller squares…

• Imagine that each grid square is divided into another 10 rows and 10 columns…

• You now use 6 numbers to describe a position…

• After you give the main coordinate eg. 24, you then add a number 0-9 to describe where exactly the position is.

• For example,

X=248115

Z=242118

12

Z

X

11

24

25

### Give it a go at…

http://mapzone.ordnancesurvey.co.uk