Removing enemy spotted message

[kyle9154]

How do I remove the message 'engage, maintain current orders, or go to periscope depth' that comes up when enemy ship is spotted while cruising in high time compression? I do want the game to stop to 2x when a ship is sighted but I want it so I have to identify that it is a enemy vessel instead of a computer program auto identifying an enemy, makes it too easy that. U-boats had to get closer to identify lone merchants of their nationality, they couldn't tell like 12-16 kms away through binoculars that it was an enemy vessel or even armed for that matter at that distance. It would make my experience especially in early war that much more authentic to remove the automated message that comes up for enemy contacts.