Flotilla 12-10
Navigation Study Guide
Chapter 9: Radionavigation
Instructor: Fred Williston
All Questions are important for exam
PowerPoint Presentation
by Forrest Meiere
Flotilla 12-10
Navigation Study Guide
S9-1. The absolute accuracy of Loran-C is between ___
0.1
0.25 nautical miles.
and ____
S9-2. The components of the Loran-C system include
an onboard navigation receiver and a_______________
chain of three to
___________________________
five land-based transmitting stations.
Flotilla 12-10
Navigation Study Guide
S9-3. Using Loran-C, position is determined as the
intersection of _______________________________
two or more lines of position based
on the TDs.
S9-4. Loran-C LOPs are not printed on most harbor charts
the corrections for signal propagation are more
because _________________________________________
complex and variable for near shore areas than for
outlying areas. Consequently, the possible errors may
be larger.
Flotilla 12-10
Navigation Study Guide
S9-6. The principle of operation of GP5 is based on
satellite ________.
ranging
S9-8. The stated accuracy of the GPS under S/A (95% of
100 meters horizontally
the time) is _____________________.
Flotilla 12-10
Navigation Study Guide
S9-9. A system of improved accuracy based upon additional
corrections to GP5 is termed _______________.
Differential GPS The
horizontal accuracy of this system is approximately
_________.
10 meters
S9-10. To ensure best accuracy for GPS receivers it is
important to set the _______________
horizontal datum to the same as
that used on the nautical chart.
Flotilla 12-10
Navigation Study Guide
S9-11. A waypoint is an imaginary point that can be
stored in the navigation receiver.
______
S9-12. The cross-track error is defined as __________
the closest
distance
_____________________________________________.
of the aircraft or vessel to its intended track
Flotilla 12-10
Navigation Study Guide
S9-13. An arrival alarm warns the mariner when
the
vessel or aircraft passes within a user-defined
__________________________________________
distance of a destination waypoint.
S9-14. The modem radar display screen is known as a
Plan Position Indicator
____________________.
Flotilla 12-10
Navigation Study Guide
S9-15. The two principal uses for radar aboard ships are
__________
Navigation and __________________.
Collision Avoidance
S9-16. Rule 7 of the NA VRULE5 states that " Proper
______
use shall be made of radar equipment if fitted and
operational, including long-range scanning to obtain
early warning of risk of collision and _____________
radar plotting or
equivalent systematic observation of detected objects."
Flotilla 12-10
Navigation Study Guide
S9-17. Two major radar display types are:
______________
Ship’s head up and _________.
North up
S9-18. To increase the accuracy of range estimates, most
radar units are also equipped with one or more ________
variable
_____________.
range
markers
Flotilla 12-10
Navigation Study Guide
S9-19. To increase the accuracy with which relative
bearings can be read, most modem radar units have one
electronic bearing markers or electronic
or more ___________________________________
bearing lines.
S9-20. A CBDR target is one that exhibits ________
constant
_______
bearing and ________________
decreasing range presents a risk of collision.
Flotilla 12-10
Navigation Study Guide
closest point of approach
S9-21. CPA stands for the ______________________
and provides a possible indication of collision risk.
S9-22. The relative motion plot is used to determine the
following quantities: _________________________.
direction of relative motion
_____________________
____________________
closest point of approach and time
to the closest point
of approach.
Flotilla 12-10
Navigation Study Guide
S9-23. The vector diagram is used to determine the
speed
target's course
______ and _____.
S9-25. ARPA is an acronym for ________________
Automatic Radar
Plotting Aid.
End of Questions