In our Inquiry learning this week, we were wondering how Tudor explorers were able to map and locate their position in the World. 6JP have been learning how to locate places on maps using six digit coordinates.
We used Ordnance Survey Maps and learnt how maps use keys to provides information about the meaning of symbols on the map.
Then we learnt that a map uses a a series of squares linked together to form a grid. We learnt that the grid allows us to find things within them. We found out that different maps use different scales. The maps we used had grids that meant that every square on the Ordnance Survey map was the same as a square kilometre (1 000 000 square metres or 1km2 of the actual landscape).
Eastings and Northings
We learnt that the grid lines are numbered. Across the top and bottom edges the numbers increase west to east – these are called eastings. Along the left and right-hand sides of your map the numbers increase from south to north – these lines are known as Northings.
Four-figure grid references
We first learnt how to find four figure grid references. Where an Easting and a Northing line meet in the left hand corner of a square, you can put these two numbers together to form a four-figure grid reference.
It’s important to remember that the easting comes before the northing in a grid reference.
In mathematics we remembered to write coordinates by using the saying, ‘along the corridor and up the stairs’ and when locating places on a map, we understood, the same rules can be used.
Six-figure grid references
We learnt that we needed to be more accurate with the grid references and that the grid squares could be further divided into ten in our heads.
By adding an extra number (between 1 and 10) to the Easting and the Northing, we were able to come up with a six-figure reference that pinpoints a place to within 100 metres on the map.