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Visual Signals
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Introduction Communication is the link that allows the Navy, and the entire armed forces, to maneuver as a cohesive fighting force. Even though modern technology has increased the range and ease of communication the basics must be learned in the event technology fails .
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Class Objectives Identify three main visual communication methods used by the Navy. Understand the method of flashing light and Morse Code. Identify the dual meaning of maritime flaghoist flags. Learn to send and receive messages using semaphore.
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Visual Communication Methods
Flashing Light Semaphore Flaghoist
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Directional (day or night use) Omni Directional (night use only)
Flashing Light Directional (day or night use) Searchlight, Multipurpose Light Omni Directional (night use only) Yardarm Blinkers Directional is used during day or night Omni Directional is for night use only International Morse Code is used to send signals
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International Morse Code
Flashing Light A B C D E F G --. H I J K L M N -. O P Q R S T U ..- V W X Y Z --.. International Morse Code
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Flaghoist Rapid transmission of message Very accurate
Daytime use ONLY!
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Flaghoist 68 flags in an Allied Flag Bag 26 Letter Flags
10 Numeral Flags 10 Numeral Pennants 18 Special Flags and Pennants 4 Substitutes
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Each of the 26 Letter Flags has a stand alone meaning
Flaghoist 26 Letter Flags Each of the 26 Letter Flags has a stand alone meaning
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Flaghoist A – Diver Below (when stationary) or undergoing a speed
trial B – Taking on or discharging explosives C – Affirmative (yes) D – Keep Clear, I am maneuvering with difficulty
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Flaghoist E – Altering course to starboard
F – Disabled, communicate with me G – I require a pilot H – I have a pilot on board
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Flaghoist I – Altering course to port
J – Am going to send a message by semaphore K – Stop instantly L – Stop, I have something important to communicate
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Flaghoist M – I have a doctor on board N – Negative (no)
O – Man overboard P – All aboard, vessel about to put to sea or lights are out (at sea)
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Flaghoist Q – My vessel is healthy and I request free pratique
(permission to land vessel at a foreign port) R – The way is off my ship, you may feel your way past me S – My engines are going full speed astern T – Do not pass ahead of me
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Flaghoist U – You are standing into danger
V – I require assistance (not distress) W – I require medical assistance X – Stop carrying out your intentions and watch for my signals
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Flaghoist Y – I am carrying mail or I am dragging anchor
Z – Used to address or call shore stations or I require a tug N & C – I am in distress
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Flaghoist 1 2 3 4 5 6 7 8 9 10 Numeral Flags
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Flaghoist Practical Exercise
1) 2)
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Flaghoist Practical Exercise (con’t)
3)
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Semaphore Quickest method to send a message Most difficult to read
Signalmen use flags or lighted wands Used in day or night Very short range Position of flags or wands indicates letter or symbol of message
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Semaphore
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Semaphore A B C D E F
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Semaphore J K L G H I
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Semaphore P Q R M N O
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Semaphore S T U V W X
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Semaphore Y Z
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Semaphore Practical Exercise
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Summary Identify three main visual communication methods used by the Navy. Understand the method of flashing light and Morse Code. Identify the dual meaning of maritime flaghoist flags. Learn to send and receive messages using semaphore.
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