Hello Captains

,
I would like to know how to disable contact colors,i mean when i see a ship in my navigation map i see it as Red which is enemy, Green as Neutral, and Blue as Alied, so is there any way to make all these contacts grey, so that i will be forced to identify them, i really dont like when i spot an contact and my Watch officer shouts that Enemy Ship Spotted etc.. and in an instant i know what type of contact it is.
BTW iam playing with realistic navigation off.
Waiting For Answers