ON21 - That's a great suggestion from Broken Beagle about learning the OS Map legends -
You've probably already bought an OS map of your local area -
Time spent studying it will be well worthwhile.
Study the contour lines of the map and with practice
you should be able to form a mental picture of the terrain - hills etc .....
A "3D" view of the above might look something like this ( viewed from the East )
Check your PM's for more "O.S." info !
Coconutty