Using the maps becomes very straightforward once you know what you are doing.
You will find a selection of buttons in the corner of each map, the key symbols, and each one is self explanatory:
Pressing + will zoom in on the map
Pressing - will zoom back out again
You can move the map around either by left click & holding, then move your mouse to move the map
or by using the the arrow keys in the key symbols < ^ > in the corner of the map.