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ROTC
Semaphore Navigation
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Created by
Carl Manrique
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Cards (47)
Near shore navigation
Piloting
Latest well determined position
Dead reckoning
Collecting info, use electronic devices
Electronic navigation
Sun, moon, planet, stars
Celestial navigation
True sphere/ ablate spheroid
Earth
Diameter about which earth rotates
Axis
Circle on surface of earth
Great Circles
The plane which does not pass center
Small circle
Great circle, equidistant to poles
Equator
Origin
of measurement of longitude
Prime Meridians
Passes through poles
Meridians
Angular
distance northward/southward
Latitude
Eastward
/
westward
Longitude
Angular inclination
Direction
Intended
direction
Course
Ship points
or heads
Heading
Direction of terrestrial object
Bearing
Velocity of travel express in knots
Speed
1knot
/
1 minute
of
angular measurement
6
,
080.2
ft/ hr ,
2000
yards
External
to vessel, assist navigator
Aids
to
navigation
Man made permanent fixture
Lighthouse
Lighthouse but unwatched
Lighted beacons
Continuous steady light
Fixed light
Single flash, regular interval
Flashing lights
Two
or
more
flashes
Group flashing
Less than
60
flash per minute
Quick flashing
Quick flash
4
sec with
4
sec of
darkness
Interrupted quick flashing
0.4
to
4
seconds
Short long flashing
Hroup
of
2
more
eclipse
Group occulting
Standard colors of lights WRG
WHITE RED GREEN
Range
of
visibility
Brilliancy
Shape of tin cylinder
Can buoy
Truncated cone
Nun buoy
Compressed
gasses
Bell buoy
Slightly tapering pole
Spar buoy
4
gongs
Gong buoy
Cone shaped
,
whistles
Whistle buoy
Batteries or gas tanks, skeleton tower
Lighted buoy
Light
/
sound
signal
Combination buoy
Radar reflector
Radar reflected buoy
See all 47 cards