To see small contacts (like a lifeboat) on edge of the 24nm range scale, your vessel would need to leave an antenna height of ____
...
When using Trial Maneuver on an ARPA display, target vectors must be set to which motion display?
Relative
A RADAR display which is oriented, so that north is always at the top of the screen is called?
Stabilized Display
RADAR makes the most accurate determination of the?
Distance of Target
An Azimuth Stabilized Radar display compensates for what motion of a vessel?
Yaw
A RADAR contact will remain stationary on a relative motion RADAR display only when the contact is ____
On the same course and speed as your vessel
The Closest-Point-of-Approch (CPA) of a contact on a relative motion RADAR display may be determined ____
After the contact has been marked at least twice
The 3-cm RADAR as compared to the 10-cm RADAR with similar equipment specifications will___
Display better map-like presentation (better resolution) for inshore navigation
What is the wavelength of an X-Band RADAR?
3 cm
The Radar control known as the Sensitivity Time Control is commonly referred to as?
Sea Clutter
In a True Motion Ground Stabilized Radar display with a significant set and drift and your vessel keeping a constant heading, a fixed object will?
Remains Stationary
Using the e-r-m method of vector triangle plotting, the true motion movement of the target on the plotting sheet is designated as?
e to m
Generally speaking, as a Pulse Repetition Rate goes down on a larger range scale, Pulse Repetition Length becomes?
Longer
After what marine accident did RADAR training for bridge watch-standers become mandatory?
Andria Doria
A radar range plotted on a nautical chart will provide a LOP in the form of a(n)
Line
A vessel constructed out of ____ should theoretically have the best radar reflection on a radar scope.
Steel
According to the Rules of the Road, which statement is true concerning a vessel equipped with operational RADAR?
The vessel's watch officer must use this equipment to obtain early warning of a risk collision.
The Rules of the Road requires that the Mate on Watch consider the overall characteristics of his RADAR equipment in determining speed at which his vessel should be proceeding at.
TRUE
Which of the following conditions will usually decrease the normal radar maximum detection range?
Sub-Refraction
What input(s) (external from the RADAR) does your ARPA need to calculate target data for a designated target?
Both A & C (Own Ship STW and Own Ship heading.
What is the minimum number of minutes you should wait until utilizing ARPA data for collision avoidance decision making?
3 minutes
You have set your ARPA limits defining dangerous targets as CPA range of 3 nm and Time of CPA of 12 minutes. Which of the following would cause the "Dangerous Target" alarm to activate?
When the Acquired target has a CPA of 1.8 nm and a Time of CPA of 10 minutes
The ARPA will activate a warning alarm if the Gyro or speed inputs stop but it will not give an alarm if these same inputs are erroneous.
TRUE
A watch stander can measure the error in the ARPA data by comparing this data to ____
A Radar transfer plot
To graphically represent CPA on ARPA, You can do the following:
...
Which of the following ARPA symbols represents a dangerous target as defined by CPA and TCPA settings?
B (Triangle)
How would you use an EBL and VRM line/arc on your Radar to measure range and bearing?
...
An advantage of having AIS overlay capabilities on a(n) ARPA display is?
...
What will occur if a target enters a Guard Zone on an ARPA display?
Both of the above (Alarm will sound and ARPA will automatically begin tracking target)
When more than one contact occupies the same tracking gate, what can happen?
Any of the above
If the gyro fails, the ARPA will default into which display?
Heads up
Which of the following RADAR controls must be properly set when you are using ARPA?
All of the above (Brilliance, pulse length, selection of bandwidth (X or S) depending on current conditions)
Which of the following is true?
Action to avoid a collision shall not be based on scanty radar information
The ARPA will signal an alarm to warn the operator of target swap.
FALSE
Your heading flash is oriented to the top of you scope and it indicates that you are on a heading of 090T. You change course to 110T and the heading flash shifts 20 degrees right but the display remains stable. Which display type are you using?
Course up
Your Radar is set to an Offset relative motion display, which of the following will not appear to move across the display?
A vessel on the same course and speed as you
You are using a Head Up display. When bearing are measure they will be: ____
Relative
If the gyro input to the RADAR fails, you can still operate the equipment in ___ mode.
Heads up
A Racon will display a Morse signal on your radar scope ___.
At regular intervals
Minimum detection range is influenced by all of the following except?
Shadowing from observing ship's structure
The gain control adjusts the ___.
Receiver sensitivity
Bearing discrimination is the ability to display separately two targets ____.
...
A lookout is not required if your ships is equipped with a Radar/ARPA.
FALSE
In determining safe speed, vessels equipped with radar should NOT consider ___.
ETA at the pilot station
In determining risk of collision proper use shall be made of radar equipment including long range scanning to obtain early warning of risk collision.
TRUE
Vertical Beamwidth has an effect on minimum detection range
TRUE
What is the wavelength of an S band radar?
10 cm
What is the approximate transmit frequency of an X band Radar?
...
Tankers of 10000 grt or more are required to carry ___.
Both of the above (Radar and a second completely independent radar system)
A Radar SART will indicate a Morse code signal on true bearing on a 10cm Radar.
FALSE