TERNAV2 (PRELIM) Flashcards
In determining the vessel’s position accurately, these _ play a crucial role in assisting the navigator.
navigational instruments
It also provides reliable information regarding the vessel’s position in terms of latitude and longitude coordinates
navigational instruments
During the _ stage of passage planning, utilizing these instruments will help ensure the vessel stays on her course and follows the planned route effectively
Execution and Monitoring
Navigators can verify the vessel’s position in terms of geographical coordinates, using a.
chart/nautical chart
Charts can be used to plot
DR(Dead Reckoning),EP(Estimated Position), FP(Fix Position) and track the vessel’ progress along the planned route
provides the indication of the vessel’s heading, and when the appropriate corrections are applied, (Variation and Deviation), the vessel’s true course can be determined accurately.
Compass
, are used to measure distances between the vessel’s plotted position and the referenced charted object on a nautical chart.
Compass dividers
A navigational instrument used for
determining the angle between the horizon
and a celestial body such as the Sun, the
Moon, or a star.
sextant
It is used in celestial navigation to determine
the vessel’s geographical position in terms of
latitude and longitude.
sextant
A satellite-based navigation system that
uses a network of satellite which
provides accurate position information
anywhere on Earth.
GPS ( G L O B A L
P O S I T I O N I N G
S Y S T E M )
is an effective instrument to
determine a vessel’s position when the
visibility has dropped
Radar
It also provides range and bearing of the
interrogated object, using it as a reference
point in determining the vessel’s position
R A D A R
( R A D I O
D I R E C T I O N AND RANGING
An effective way of utilizing radar is by _ in conjunction with
a chart and comparing the radar bearing by
visual bearings.
Cross- checking the radar range
The geographical location of a vessel
relative to a reference point or the
coordinate system ( Latitude and
Longitude)
P O S I T I O N
It can be represented in terms of
specific coordinates or plotted
graphically on a nautical chart.
P O S I T I O N
It is the determination of position by advancing a last
known position for courses and distance
D E A D
R E C K O N I N G
P O S I T I O N ( D R )
The method used to forecast where the vessel will be,
knowing the _
true course and speed alone
It does not consider external factors such as currents, wind drift, or magnetic variation, so it provides an approximate position based solely on the vessel’s or aircraft’s movements
D E A D
R E C K O N I N G
P O S I T I O N ( D R )
A method to forecast where the vessel
will be, knowing true course and speed,
set and drift
E S T I M A T E D
P O S I T I O N ( E P )
It considers factors such as course
changes, speed variations, and external
influences (e.g., currents, wind) since the
last known position
E S T I M A T E D
P O S I T I O N ( E P )
Refers to a precisely determined
location of a vessel at a specific
point in time
F I X E D
P O S I T I O N ( F P )
Obtained through accurate
navigational methods such as
celestial navigation, GPS (Global
Positioning System), radar fixes, or
visual bearings to known landmarks
F I X E D
P O S I T I O N ( F P )
