NAV5
Navigational Radar and ARPA Mastery Quiz
Test your knowledge on NAV5, radar systems, and ARPA technology with this comprehensive quiz designed for navigators, maritime enthusiasts, and students of navigation. Enhance your understanding of how radar technology affects navigation and collision avoidance procedures.
- 30 carefully crafted multiple-choice questions
- Covers radar performance, ARPA operation, and maritime regulations
- Ideal for certification or self-assessment
How does inclement weather affect RADAR/ARPA?
Maximum range of contact is reduced
Maximum range of contact is increased
Unwanted echoes are not produced by sea return
The distance of detection increased gradually
At what distance does sea return disappear?
1-2 miles
2-4 miles
6-8 miles
10-12 miles
In ARPA acquisition, targets not detected in five consecutive scans become ___
New target
Lost target
Bad target
Lost echoes
What structures would not cause blind and shadow sectors to radar?
Skylight
Funnel
King posts
Masts
ARPA is based on ___
+/- 5 of roll
+/- 10 of roll
+/- 15 of roll
+/- 20 of roll
Which of the following is not stabilized Which of the following is NOT stabilized?
Ship's head-up relative motion
North-up, True motion
North-up, relative motion
True motion
Which ARPA display mode shows without azimuth stabilization in which the line connecting the center with the top of the display indicates ownship's heading?
A. Head-up mode
b. North-up mode
C. Course-up mode
D. Head-up TB mode
The display on which ARPA information is presented should have an effective diameter of at least
A. 300 mm
B. 310 mm
C. 320 mm
D. 340mm
The position of own ship on such a display moves in accordance with it's own motion is called __
A. Relative motion display
B. True motion display
C. Target's predicted motion
D. Relative target motion display
10. After switching power on the radar, you will have to wait until the set warms up for ___
A. 60
B. 100
C. 120
D. 180
11. Which of the following would NOT be considered an input to the computer of a collision-avoidance system
A. Own ship's exact position from navigation satellite receiver
B. Own ship's wind velocity from an anemometer
C. Own ship's gyrocompass heading
D. Own ship speed from doppler log
Which factor is not considered in establishing a safe CPA?
Rules of the Road
Own vessel's characteristics
Weather and sea condition
ETA of the vessel
The length of the vector depends on the ____
Time that the operator enters
Range of the target
Course of the target
Ownship course
14. Which name is associated with a tracked target that appears to have been temporarily lost or which has a poorly radar aspect, in so much that, the target does NOT have tracking ability?
A. Lost target
b. Lost echo
C. Bad target
D. Bad echo
15. It shows on the PPI scope a flashing triangle apex down, used to mark the target
A. Target entering guard ring
B. CPA/TCPA warning
C. Collision warning
D. Lost target warning
16. It shows a flashing diamond formed from two equal triangles, one apex up the other apex down.
Target entering guard ring
B. CPA/TCPA warning
C. Collision warning
D. Lost target warning
17. It shows a flashing triangle apex up, used to mark the target
Target entering guard ring
B. CPA/TCPA warning
C. Collision warning
D. Lost target warning
18. It shows a square indicated by its corners centered around the target symbol.
A Tracked target
b. Target entering zone warning
C. Selected target
d. Target in acquisition state
19. Which of the following ARPA data should you use in order to determine if a close quarter situation will develop with vessel?
A. Relative track information
B. Predicted time of CPA
C. Set and drift of the current
D. Bow cross-time
When using an ARPA, which of the following should you consider in order to evaluate information displayed?
Target vessels generated course and speed are based solely on radar inputs
Navigational constraints may require a target vessel to change course
The trial maneuver feature automatically determine a course that will clear all target
The ARPA will give an audible and/or visual lost target alarm
A navigator fixing a vessel's position by radar __
Should never use radar bearings
Should only use radar bearings when range increase
Must use information from targets forwards of the beam
Can use radar information from one objects to fix the position
22. Which term refers to the selection of targets that requires tracking procedure and the initiation of their tracking?
A. detection
B. tracking
C. acquisition
D. Radar plotting
From the following remarks on Rule 8 of COLREGS 72 are mentioned correctly EXCEPT:
Taking all way off
Succession of little alteration
Optimistic approach in a ample time
Stacken speed by moving rudders hard to both side
24. When navigating in restricted visibility a power-driven vessel shall __
A. Have her engine ready for immediate maneuver
B. Operate at a speed to be able to stop on the distance of her visibility
C. When making way, sound one prolonged blast at intervals of not more than one-minute
D. Stop her engine when hearing a fog signal forward of her beam, even if risk of collision does not exist
25. In radar maneuvering, it is better to make a 30 degrees course change in ___
A. 3 alterations of 10 degrees each
B. 6 alterations of 5 degrees each
C. 1 alteration of 30 degrees
D. 2 alterations of 15 degrees each
26. Which rule obligates the mariner to determine if a closed quarter's situation is developing and/or risk of collision exists by radar plotting?
A. Rule 18 (b)
B. Rule 18 (d)
C. Rule 19 (b)
D. Rule 19 (d)
27. A technique used as a measure to monitor the progress of a vessel on the track and to minimize the cross-track disctance
A. Trial maneuver
b. Radar Plotting
C. Parallel indexing
D. Trails
28. The distance the vessel is to one side of the straight line between two waypoints
A. Cross-track error
B. Vector length
C. Variable range marker distance
D. All of the above
Vessels required to have an Automatic Radar Plotting Aid must have a device to indicate the ___
Distance to the next port
Time of the next navigational satellites passes
Speed of the vessel over the ground or through the water
Estimated time of arrival to the next port
30. When will ARPA provide true data?
A. Immediately after acquisition
B. Within one minute from the start of tracking
C. After about 2 minutes of tracking
D. After about three minutes of tracking
31. What is the purpose or function of the "Trial mode" used in most ARPA equipment?
A. It is used to allow the results of the proposed maneuver to be assessed
B. It selects trial dots for targets recent past positions
C. It is used to display target position and your ownship data such as CPA
D. None of these
32 Your ARPA has automatic speed inputs from the log due to currents, the log is indicating a faster speed than the speed over the ground. What should you expect under these circumstances?
A. The target true course vector will be in error.
B. The range of initial target acquisition will be less than normal
C. The generated TCPA will be later than the actual TCPA
C. The generated TCPA will be later than the actual TCPA
33. In for you observe your radar and determine that the risk. You should ____
A. Stop your engines
B. Sound the danger signal at two minutes intervals of collision exists with a vessel that is 2 miles off your port bow.
C. Hold course and speed until the other vessel is sighted
D. Take avoiding action as soon as possible
34. You have been tracking a target and have generated the target course and speed. The radar did not receive a target echo on its last two scans due to the weather. What should you expect under these circumstances?
C. The ARPA will give an audible and for visual lost target alarm
B. The ARPA will generate data based on sea return echoes from the vicinity where the target was lost
A. The ARPA will not generate any data
D. The ARPA will generate data as if the target was still being tracked by radar.
35. What will cause the ARPA to emit a visual alarm, audible alarm, or both?
A. An acquired target entering into a guard zone.
B. A tracked target fost for one radar scan.
C. A tracked target entering your preset CPA-TCPA limit
D. A target being initially detected within a guard zone.
36. In ARPA, in what case you have lost target?
A. False echo
B. Target too far
C. Small target in bad weather
D. Poor sensitivity
Your ARPA had two guard zones, what is the purpose of the inner guard zone?
Alert the watch officer that a vessel is approaching the preset CPA limit
Guard against target loss during critical maneuvering situation
Warm of small targets that are initially detected closer than the outer guard zone
Sound an alarm for targets first detected within the zone
38. When will ARPA emit an alarm to denote that a target is lost?
A. Immediately when no evidence of target is found
B. After one minute when no evidence of target is found
When no evidence of the target is found after five successive sweeps of the antenna
When no evidence of the target is found after three successive sweeps of the antenna
The recognition of the presence of a target is called __
Tracking
Detection
Acquisition
Plotting
40. The closest point of approach of a contact on a relative motion radar may be determined
A. Immediately when the contact is noted on the radar
B. Only if radar scope is watched constantly
C. By an occasional glance at the radar
D. After the contact has been marked at least twice
41. Comparing manual and automatic acquisition in ARPA, which is most sensitive?
A. Manual acquisition
B. Automatic acquisition
C. Not relevant
D. Same sensitivity
42 The ARPA may swap targets when automatically tracking if two targets ___
Are tracked on reciprocal bearings
Are tracked at the same range
Are tracked on the same bearing
Pass close together
You are using a radar in which your ownship is shown at the center, and the heading flash always points at zero. If bearings are measured in relation to the flash, what type of bearings are produced?
True bearing
Compass bearing
Relative bearing
Magnetic bearing
A radar contact will remain stationary on a relative motion radar display only when it is __
On the same course as your vessel
At the same speed as your vessel
On the same course and speed as your vessel
On a reciprocal course and the same speed as your vessel
These are methods of Collision Avoidance, except __
Altering course, maintaining speed
Preserving course and altering speed
Simultaneous alteration of course and speed
Preserving course, maintaining speed
Target aspects are measured from __
Target course and direction of relative motion
Target course and bearing of an own ship from target
Target course and 2nd observation bearing
Own ship course and target course
47. A radar range to a small, charted object such as light will provide a line of position in which form?
A. Straight-line
B. Arc
C. Parabola
D. Hyperbola
48. The most accurate position by radar fix is __
A. The intersection of two radar bearings
B. Radar range and visual bearing
C. Radar range and radar bearing
D. Two radar ranges
49. What is the process of observing the sequential changes in the position of a target, to establish its motion?
A. Detection
b. Tracking
C. Acquisition
d. Plotting
50. Does the COLREGS give any preference to ships equipped with ARPA?
A. Yes
B. No
C. Only in good visibility
D. Only during reduced visibility
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