You need to close enough so that you can see the ships in harbor through your periscope. Naturally, the distance varies according to the weather. Lock on to target, and take photo - first click on the periscope button on the lower left, then on the camera button. Check mission status screen to see when you complete the mission - I think you need to photograph 10.000 tons worth of ships, so 3-4 small merchants or one old big tanker.
As for the destroyers, run silent!
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