Last week we learnt how to measure the distance of a wiggly route so that you can have a pretty good idea of how far it is, and thus how long it is going to take, to get from A to B. But there is one other thing that you need to consider, especially if you are travelling on foot. Have you got to climb a hill?
It won’t make much difference if you are travelling by car, but on foot a hill is going to slow you down. Fortunately, a good map will show you the hills, you just need to know how to recognise them.
If you look carefully at a detailed Ordnance Survey map you will see a pattern of light brown lines, some of which are numbered. If your route crosses one of those lines, then you will be changing height. To work out if you are going up or down the hill you can check the numbers on the lines as these show the height above sea level.
If there are lots of lines, close together, it can be quite difficult to work out what is going on. Why not take a local map with you on your lockdown exercise. Then you can compare the contour pattern to what you can see in real life.