As well as changing the scale of the map by zooming in and out, you can also set it to a specific scale.
The control for setting the scale is in the bottom left of the screen.
How to set the scale of the map
- Make sure that the map is centred on the point that you are interested in.
- Click in the scale box at the bottom left of the screen and type in the figure for the scale you want to use (anything from 500 - 500000). There will be a slight pause and then the map will be displayed at that scale.