VISUAL COMMUNICATIONS

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VISUAL COMMUNICATIONS
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VISUAL COMMS METHODS
SEMAPHORE
FLAGHOIST
FLASHING LIGHT
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SEMAPHORE
Quickest method, but difficult to read
Signalman uses flags or lighted wands
Position of flags/wands indicates letter or
symbol of message
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FLASHING LIGHT EQUIPMENT
Directional searchlight
Multipurpose light
Omnidirectional signal lights/yardarm blinkers
Regular or infrared lights
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FLASHING LIGHT
Infrared signal lights must be read with
infrared viewers called
NANCY GEAR
The U. S. Navy uses the AN/PVS 7 AND AN/PVS 8
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FLAG HOIST
Bridge watch officers MUST be able to read
flaghoist signals
Involves use of multi-colored flags and
pennants
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FLAGHOIST TERMINOLOGY
Flagbag - a metal box containing a set of flags
and pennants
Halyard - a line running from the flagbag to the
yardarm
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FLAGHOIST TERMINOLOGY
Retriever - line attached to a halyard in order
to recover it if necessary
Display - A complete signal can be on one or
more hoists
Bend on - to hook a flag/pennant onto a halyard
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FLAGHOIST TERMINOLOGY
Point of hoist - highest point on halyard to
which the signal is raised
At the dip
Closed up
Hauled down
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Flaghoists are read as follows
Stbd over port
Outboard to inboard
Top to bottom
Maximum of five flags per hoist
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TACKLINES
A length of line, equal in length to a
flag/pennant
Used in visual displays just as "tacks" are used
in R/T signals
Tacklines do not count toward the five flag max
per halyard
Tacks are understood, as necessary, between
adjacent hoists
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SUBSTITUTE PENNANTS
The four sub pennants are used to repeat a flag
in the same hoist
First sub repeats the first flag on the hoist,
second sub repeats the second flag, etc.
1st Sub
2nd Sub
3rd Sub
4th Sub
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A sub pennant can stand for another sub pennant.
Turn
Port
One
3rd sub 3rd flag in hoist One
4th sub 4th flag in hoist 3rd sub One
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ANSWERING, ACKNOWLEDGING, AND EXECUTING
Originator sends signal
Addressee answers by repeating each hoist at the
dip
When signal is understood, addressee closes it up
Originator executes signal by hauling it down
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VISUAL RESPONSIBILITY
OTC sends signal
In a line formation
Intermediate ships hold their displays at the dip
Ship farthest from the OTC closes up the signal
when it's understood
Intermediate ships close up their displays
When all ships have acknowledged, OTC executes
by hauling down the signal
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VISUAL CALL SIGNS
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INTERNATIONAL CALL SIGNS
Call signs assigned to all radio stations
- First letter indicates nationality of the
station
U. S. Navy call signs begin with "N"USN ships
are required to hoist their call sign when in
inland waters
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GOVERNING PENNANTS
These pennants are used to change the meaning of
a signal
Negative
Interrogative
Preparative
("Prep")
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To question a signal that is not understood
- hoist the signal at the dip
- hoist INT closed up on the next halyard
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Other Uses of INT
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Single Pennants and Flags
Flags and pennants have special meanings when
flown singly
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on pages 2-15-7I and 8I, it will show you the
breakdown of these highlighted areas
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The instructor will hand out the in class
assignment and will go over the answers after
everyone has completed their visual blank
message.
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Name_____________
VISUAL MESSAGE BLANK
BT
UNCLASS
CONREP
OOD
TODAY
FL
R
COMDESRON THREE
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VISUAL COMMUNICATIONS