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Visual Communications NS 302

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Flashing Light. Signal Book. Organization. Decoding Messages. Encoding Messages ... Flashing Light. Flag Hoist. Flag Hoist. Rapid. Accurate. Allows a more ... – PowerPoint PPT presentation

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Title: Visual Communications NS 302


1
Visual CommunicationsNS 302
2
Lesson Overview
  • Visual Comm Methods
  • Flag Hoist
  • Semaphore
  • Flashing Light
  • Signal Book
  • Organization
  • Decoding Messages
  • Encoding Messages

3
Visual Communication Methods
  • 3 Types
  • Flag Hoist
  • Semaphore
  • Flashing Light

4
Flag Hoist
5
Flag Hoist
  • Rapid
  • Accurate
  • Allows a more uniform execution of maneuver
  • Daylight use only

6
Flags
  • 68 Flags in Allied Flag Bag
  • 26 Alphabet Flags
  • 10 Number Flags
  • 10 Number Pennants
  • 18 Special Flags and Pennants
  • 4 Substitutes

7
Alphabet Flags
8
Numeral Flags
9
Numeral Pennants
10
Special Flags
11
Substitutes
12
Hoist
  • Signal consisting of one or more flags on one or
    more halyards

Turn
Starboard
Nine
13
Display
  • A complete signal or group of signals

Corpen
Speed
Starboard
V
Nine
Two
Five
14
Reading Flag Hoists
1
2
3
4
5
6
Port to Starboard Outboard to Inboard Top to Bot
tom
15
States of a Flag Hoist
Hauled down
16
Semaphore
17
Semaphore
  • No equipment required
  • Faster than flashing light
  • More secure than flashing light
  • Very short range
  • Day or nighttime use

18
Flashing Light
19
Flashing Light
  • 2 Types
  • Directional
  • Non-Directional
  • Directional - Day or night use
  • Searchlight pointed at receiver
  • Non-directional - Night use only
  • Yardarm blinkers
  • Infrared blinkers - read using NVGs

20
Signal Book
21
Signal Book
  • Used primarily with
  • flaghoist
  • radio
  • 3 sections
  • Instructions (Ch 1)
  • Signals (Ch 2-33 used to decode)
  • Index (used to encode)

22
Decoding Signals
TL66-1
  • Look in Tactical (TL) chapter (Ch 27) of signal
    book.
  • Find TL66
  • Decode signal
  • Patrol Harbor Entrance

23
Decoding More Signals
1
2
3
4
5
6
24
Decoding More Signals
  • 1. FORM B
  • 2. DESIG N3R
  • 3. B CORPEN 040
  • 4. A SPEED 10
  • 5. W SPEED 25
  • 6. CG9
  • Form a column in quickest sequence on ship
    indicated (N3R) at standard distance
  • Base course 040
  • Base speed 10kts
  • Stationing speed 25kts
  • Alter course as necessary to clear obstruction in
    channel.

25
Executing Signals
  • Sender
  • Receiver

Execute signal Haul down signal
Receiver understands message Closes up signal
Sender sends message Closes up signal
Receiver receives message Repeats signal at the d
ip
26
Executing Signals
  • Sender
  • Send signal
  • Close up signal
  • Execute signal
  • Haul down signal
  • Receiver
  • Received signal
  • Signal at the dip
  • Understand signal
  • Close up signal
  • Executing signal
  • Haul down signal

27
Governing Pennants / Groups
  • Modify a basic signal
  • 3 Pennants
  • Preparative
  • Interrogative
  • Negative
  • 16 Groups (BA - BZ)

28
Governing Pennants / Groups
GA7-2
  • Land the waterborne landing forces.

29
Governing Pennants / Groups
PREP GA7-2
  • Prepare (to) land the waterborne landing forces.

30
Governing Pennants / Groups
INT GA7-2
  • Are you land(ing) the waterborne landing forces?

31
Governing Pennants / Groups
NEGAT GA7-2
  • Do not land the waterborne landing forces.

32
Governing Pennants / Groups
BH GA7-2
  • Request permission to land the waterborne landing
    forces.

33
Governing Pennants / Groups
BB GA7-2 BZ
  • Landing (waterborne forces) completed
  • Well Done

34
Substitute Flags
  • Used to prevent repetition of flags in the same
    hoist.

35
Indicating Time
  • Used after a basic signal
  • Tango flag
  • Numbers representing time
  • Defers execution of a signal until the indicated
    time (instead of executing when signal is hauled
    down)

36
Indicating Time
  • T before numbers (T1835)
  • Start action no earlier than 1835
  • T after numbers (1835T)
  • Finish action no later than 1835
  • T between numbers (1935T1835)
  • First number is the finish no later than, Last
    numer is the start no earlier than

37
The Time
  • Two digits hour
  • 19 1900
  • half-hour Answer pennant
  • 16 Answer 1630
  • Four digits normal expression of time
  • 1825 1825

38
Indicating Time
  • Tango signal only affects the signal
    immediately preceding.

SPEED 25 TURN STBD 9 T14
39
Indicating Time
  • Add Bravo Tango to group signals to be affected
    by the Tango signal

BT SPEED 25 TURN STBD 9 T14
40
Maneuvering Signals
  • 6 Pennants
  • Corpen
  • Turn
  • Formation
  • Screen
  • Speed
  • Station

Each pennant has its own chapter in the signal
book. Look in appropriate chapter and decode th
e signal.
41
Description Signals
  • Indicated by the DESIG pennant.
  • All flags grouped with this pennant are to be
    interpreted literally.
  • Used only when there is no other way to express a
    signal.

42
Emergency Signals
  • Indicated by the EMERG pennant.
  • Execute signal as soon as you understand.
  • Repeat signal to other ships.

43
Single Flags and Pennants
  • Look up in single flag and pennant chapter
    (chapter 2)
  • Common Signals

44
Answer (Code) Pennant
  • Answer - used to indicate fractions or decimals.
  • Code - prefaces all signals from Pub 102
    International Code book - used to communicate
    with merchants

TURN STBD 4 ANS
Turn starboard 45
45
Encoding Signals
  • Use index to find the basic signal
  • Turn to the indicated basic signal and encode.
  • Recover man overboard.
  • TL41-13
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