If you turn off map contact updates you should get no indication of the type of ship (since theres no icon on the map).
I guess you could also replace the warship map symbol with that used for merchants, so you`d never really know what the contact was untill you spotted it.
++This is even worse in stock sh3 since the icon would show red/green/blue to indicate nationality as well as type.
At least in GWX its greyed so its a little less like some kind of wonder-radar.
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