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What methods/devices were used for communication onboard say a fighting ship during WW2?

Did they have an intercom type system so different areas could communicate directly? Were there ship-wide communications so that everyone could hear what the Captain announced? Or were there just different types of alarm sounds with different meanings? Did they have electronic signal panels or even direct/manual wire type signals?

I’m trying to understand how so many men on one ship could work effectively as a team on a ship and orders relayed.

  • Did you have a particular navy in mind? Also I suspect older (e.g. veteran WW1 vessels) ships would have different systems to newer ones. – Steve Bird Oct 20 '18 at 10:55
  • No particular navy, I was assuming they would be similar for the most part. But I am interested in the differences between different navies if any and even as you mentioned, progression from older WW1 to late and even slightly post WW2. – John Petrak Oct 20 '18 at 11:16
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There were a variety of systems in use for onboard communication on military ships during the Second World War. Different systems were used by different navies, and not all systems would be available on all vessels.


On vessels in the US Navy, the shipboard general announcing system is known as the 1 Main Circuit or simply '1MC'. This was certainly in use during WW2, and its limitations were often mentioned in battle damage reports (as with, for example, the USS Franklin (CV-13)), together with recommendations for improvements.

Alarms like General Quarters would be sent over the 1MC circuit.

An improved version of the 1MC circuit (incorporating many of the recommendations for improvements from the War Damage Reports mentioned above) remains in use on US Navy vessels today.


Royal Navy aircraft carriers like HMS Victorious also had public address systems, as illustrated in this account of HMS Victorious' service with the US Navy in the Pacific.

Similarly, the accounts of survivors from the crew of the Bismarck indicate that the German Battleship also had a ship-wide public address system.


Hard wired sound-powered telephones were also in use on US Navy ships late in the war. These would enable communication with up to 20 stations simultaneously.

United States Navy sailor with sound powered telephone

  • US Navy sailor with sound powered telephone c1944; (Image source, Wikimedia)

Sound-powered telephones had been in-use on board naval vessels since at least the First World War. They had formed part of the Fire-control system on the Royal Navy's King George V-class battleship (1911), alongside the traditional voice-pipe communications.

The types and uses of battery- and sound-powered telephones in use by the Royal Navy are detailed in the Admiralty Fleet Orders, dated 9th July 1942 (section 3258).


The 'voice pipe', or 'speaking tube' had been in use since the early nineteenth century, and remains in use to this day. The example below is from the Second World War destroyer HMCS Haida:

Voicepipe on HMCS Haida

And this example is on the bridge of the Second World War destroyer HMS Cavalier, now preserved at Chatham:

HMS Cavalier bridge


Communication between the ship's bridge and the engine room would be by means of the engine telegraph:

Engine room telegraph

The example shown here is from the decommissioned tank landing ship, USS LST-325.


Even the ship's bell formed part of a ship's emergency alarm system in the US Navy during WW2. A 'low-tech' solution which, according to this article, would be used not only to warn of a fire on board, but also to give an idea of its location:

In the event of a fire, the bell is rung rapidly for at least five seconds, followed by one, two or three rings to indicate the location of a fire - Forward, amidships, or aft respectively.

Although the image accompanying that statement in the article shows the USS Bunker Hill (CV 17) on fire in 1945, I'd quesion how far the bell could be heard during an action at sea on such a large vessel. However, it might well be very effective on smaller vessels, and would have been better than nothing!

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    I remember using sound-powered phones and the engine room telegraph when I was in the US Coast Guard, 1967-1969. They were both quite reliable. Of course, we also used the ships bells for time, and duty changes on "eight bells", but I don't recall their use during fire drills, which occurred a day. I don't recall the voice tube; I did work on the bridge and in the engine room, at different times. – Peter Diehr Oct 20 '18 at 19:42
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    @PeterDiehr I asked a friend who left the Royal Navy after completing his 22 about 15 years ago. He said he remembered there was once a procedure for using the bell during a fire, but he didn't think it was used in the Falklands (he was on one of the ships hit by an Exocet, so he'd probably know!). I don't remember seeing any USCG vessels among those still using voice tubes (and I couldn't find any documentation for more modern ships with them). I think it may be just on just older ships still in service. – sempaiscuba Oct 20 '18 at 21:38
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    Also see mightymac.org/mackinawmaritimemuseum.htm; I apparently did not use, or even notice, the voice tube on the bridge of the USCG ice breaker Mackinaw, even though I stood watch as helmsman on occasion. The Mackinaw went into service during WW II, 1944. – Peter Diehr Oct 21 '18 at 0:34
  • In the case of the engine telegraph, I understand that the engine room also had levers to indicate back to the bridge the order was received, but how would the engine room notify of say an engine failure or performance issue in such a case? – John Petrak Oct 22 '18 at 4:08
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I have also read that Royal Marine units on Royal Navy ships in WWII sometimes had 14-year-old buglers to give signals.

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    Ha ha! I was NOT expecting this, but it makes perfect sense. Do you have a reference for confirmation? – Pieter Geerkens Oct 20 '18 at 18:28

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