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12 WEEK SEAMANSHIP EXAM Questions & Detailed Answers 2024
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12 WEEK SEAMANSHIP EXAM Questions & Detailed Answers 2024
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12 WEEK SEAMANSHIP EXAM WITH COMPLETESOLUTIONS 100%
What does RADAR stand for? - correct answer Radio Detection and Ranging
How are ranges calculated? - correct answer Ranges are calculated measuring the time difference between
the radar sending out the signal and receiving back the echo
What are the components that make up a RADAR? Be able to describe each component. - correct answer
Receiver: amplifies the very weak returning echoes and demodulates them for display, Antenna: transmit
outgoing pulses/receive returning echoes, Duplexer: isolates the receiver from the transmitter while
permitting them to share a common antenna, Transmitter: produces electromagnetic waves of energy
What adjustable settings are available on a RADAR that improve its efficiency? - correct answer Rain:
adjustable filter which blocks unwanted radar return from rain or atmospheric conditions, Sea: adjustable
filter which blocks unwanted radar return caused by sea clutter, Gain: adjustable radar input which
determines the amplification of signal on video, Radar efficiency is extremely affected by these settings
What determines maximum and minimum range for a RADAR? - correct answer Minimum Range: mostly
determined by pulse length: a radar cannot receive a returning echo until the trailing edge of the pulse has
cleared the antenna and the transmit/receive switch has been switched to receive, Maximum Range: mostly
determined by frequency, peak power, pulse length and pulse repetition rate. Maximum range is usually
limited by the curvature of the earth to line of sight or slightly greater
Advantages of radar - correct answer Accuracy in determining range of objects at sea -Day, night and poor
visibility use -Radar fixes may be determined at greater distances from land than visual fixes. -Calculation of
the position may be obtained from just a single object (but 3 LOPs are required for a FIX)-May be used to
detect the presence of heavy precipitation
Disadvantages of radar - correct answer -Subject to mechanical and electrical failure -Range and Resolution
limitations -Interpretation of display can be difficult -Less accurate than visual piloting -Small object may not
be detected in high sea states -Requires transmission from the ship, which may not be tactically desirable -
Requires electric power
, What are the two beacons described in the powerpoint? - correct answer -Racon: a radar beacon that
provides, on the radar display of the ship, bearing and range of the navigation aid. It may appear as an
extended "flash" or a Morse code "flash." -Ramark: a radar beacon that provides, on the radar display of the
ship, bearing of the navigation aid. It appears as a single line from the center of the display to its
circumference.
What does GPS stand for? - correct answer Global Positioning System
What are the three segments of GPS? - correct answer Three Segments: Control, Space, Receiver/User
How many satellites are in the Space Segment? How many planes? - correct answer 24 satellites (+4 spares),
6 planes with 55° Inclination
How many satellites do you need for a 3D position? How many for a 2D? - correct answer Three for a 2D, four
for a 3D
What does Figure of Merit (FOM) indicate? Which FOM gives the best accuracy? - correct answer As we
cannot eliminate all sources of error to GPS through the receiver we use a "Figure Of Merit" to determine a
general indication of fix accuracy -FOM 1: most accurate -> FOM 9: least accurate
What are some uses of GPS? - correct answer Navigation, Surveying, Target acquisition and destruction - very
accurate!, Missile Guidance Systems, Data Collection, Integration with INS, Environmental Studies, Search &
Rescue Ops
What type of projection was your Annapolis Harbor Chart? - correct answer Mercator Projection
On which type of projection are Rhumb lines drawn as straight lines? On which type of projection are Great
Circles drawn as straight lines? - correct answer Mercator Projections, Gnomonic Projections
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