Definition of key map in English:

key map

noun

  • A map drawn in bare outline, to simplify the use of a full map.

    • ‘On the following pages you will find key maps and interactive maps to help you find the relevant authorities for shooting permissions.’
    • ‘The whole key map is in the post for you; why not try to read it and understand it?’
    • ‘Here's the key map again to refresh your memory.’