Transcript Visual Signals

United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Visual Signals
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
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 .
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Class Objectives
1.
Identify three main visual communication methods used
by the Navy.
2.
Understand the method of flashing light and Morse
Code.
3.
Identify the dual meaning of maritime flaghoist flags.
4.
Learn to send and receive messages using semaphore.
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Visual Communication Methods
• Flashing Light
• Semaphore
• Flaghoist
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
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
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Flashing Light
A
H
O
V
.....
--...-
B -...
I ..
P .--.
W .--
C -.-. D -.. E . F ..-. G --.
J .--- K -.- L .-.. M -- N -.
Q --.- R .-. S ... T U ..X -..- Y -.-- Z --..
International Morse Code
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Flaghoist
• Rapid transmission of message
• Very accurate
• Daytime use ONLY!
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Flaghoist
• 68 flags in an Allied Flag Bag
–
–
–
–
–
26 Letter Flags
10 Numeral Flags
10 Numeral Pennants
18 Special Flags and Pennants
4 Substitutes
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Flaghoist
26 Letter Flags
Each of the 26 Letter Flags has a stand alone meaning
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
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
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Flaghoist
E – Altering course to starboard
F – Disabled, communicate with me
G – I require a pilot
H – I have a pilot on board
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
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
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
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)
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
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
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
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
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
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
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Flaghoist
1
2
3
4
5
6
7
8
9
0
10 Numeral Flags
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Flaghoist
Practical Exercise
1)
2)
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Flaghoist
Practical Exercise (con’t)
3)
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
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
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Semaphore
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Semaphore
A
D
B
E
C
F
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Semaphore
G
J
H
K
I
L
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Semaphore
M
P
N
Q
O
R
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Semaphore
S
V
T
W
U
X
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Semaphore
Y
Z
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Semaphore
Practical Exercise
United States Naval Sea Cadet Corps
Region 7-1 – Recruit Training
Summary
1.
Identify three main visual communication methods used
by the Navy.
2.
Understand the method of flashing light and Morse
Code.
3.
Identify the dual meaning of maritime flaghoist flags.
4.
Learn to send and receive messages using semaphore.