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Atop Charthouse and Day Room: Neither place is a promenade. Both are waterproofed with but a thin sheet of airplane cloth. Rips and weak spots should be patched promptly. A leaky charthouse impairs navigation, ruins charts, and may damage your radio gear.
Cockpit: This "flying bridge" is the center of the boat. It has or should have the following items in and around it:
Blackout Light: An on and off switch secured to the hatch. It cuts off the charthouse lights whenever the cockpit hatch is opened, provided that the proper chartroom switch has been thrown. Traffic through the chart house should be held to a minimum. Below decks is accessible through several other hatches.
Panel Cover: A square piece of canvas which can be neatly rolled over the instruments to protect them from water and sunlight. Sunlight weakens and fades the phosphorous dials. Also it covers the glass which glares in the moonlight.
CO Release: For the Lux fire extinguishing system. Know where it is!
Black Light: is the only exposed light topside that is turned on during patrol. Its ultraviolet rays served to illuminate the phosphorous letters and numerals on the instrument panel. Its limited range of visibility makes it ideal for night work.
Cockpit Seat: Just abaft the wheel, is ideal for the footsore.
Megaphone: Keep it handy and ready for shouting orders or for listening for planes and other craft. Carry at least two megaphones. Megaphone communication between boats in a section should be used to minimize radio transmissions.