These provide a reference telling us which grid square the object is in.
Go along the bottom first & up the side second:
These provide more accurate location by specifying the exact location within a grid square.
As before, go along the bottom to get the square & then put how many tenths across it is (like a decimal point). Normally you will have to do this bit in your head as the only the numbered lines will be shown.
Repeat this on the verticle axis.
These are the brown lines & they run along the sections of the map that are the same height. They are given a number which represents the height above sea level in meters. The closer together they are the steeper the gradient.
These are the exact height of a point shown with a black dot & the height in meters next to it.
This technique uses layes of different colours to represent height.
A key indicates the value of the colours.
If the colours change quickly it shows a steep slope.
It provides a very visual and easy to read display of the landscape.