so I'm running a deathwatch game through my Colages clubs program and have taken too looking back to history for great battles to run my players through. currently i am working on a mission based off of the Raid on Dieppe. how ever I have run into one spot of trouble. I have realized I have no Idea what the Imperium of man utilised in the place of radar or at least I have forgotten.
If any one can tell me the name that would be greatly helpful.
PS I shall return with more questions and please do feel free to add battles you think I should include.