"You need to use your observation scope"
I haven't seen that, in stock game either scope will work because both have a camera icon that lights up when you lock one of the mission targets, but the TBT has no icon so it has to be one of the periscopes. It also has to be in the daytime, defined as "when the red lights are off". If it's 0540 and you can see clearly for miles and miles but the sub is still rigged for red because the game considers it "night time", the camera will be INOP.
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