[oldE]

Re: "Silent mode".
Years ago in a customer's home, I noticed an 8x8 b&w print of a fishing boat. Not only could you count scallops on the deck, but you could probably identify the crew on deck, as they were all looking up at the camera.
The fellow identified himself as a fisheries patrol officer. The image had been taken from a Grumman Tracker equipped with a big downward facing camera and lights. At working altitude, loitering, they were seldom heard from the decks of the scallop draggers. Since the boats were using work lights, they were easy to spot and monitor. When the drag with the catch of shellfish was emptied on the deck, the pilot would dive on the boat with lights out and throttles at idle. As they got to the boat, throttles would go to full power, the lights (originally designed to light up submarines on the surface) would be lit and the camera would grab a few frames. The crew would reflexively look up at the noise.
"Smile! You're on Candid Camera. "

Best
Les