An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer's vessel. Which of the following is NOT a characteristic of indirect echoes?

They always appear on a bearing of 90° from the true bearing of the contact.

Their bearing is almost constant, even when the true bearing of the contact changes appreciably.

When plotted, their movements are usually abnormal.

The indirect echoes usually appear in shadow sectors.

You are approaching a light fitted with a RACON. The light may be identified on the radar by .

a coded signal appearing on the same bearing at a

a circle appearing on the scope surrounding the light

an audible signal when the sweep crosses the light

a dashed line running from the center of the scope to the light

You are approaching a sea buoy which emits a RACON signal. This signal is most frequently triggered by which type of radar?

Signal does not depend on radar type.

In order to insure that the RACON signal is visible on your 3 cm radar, the .

rain clutter control should be off but, if necessary, may be on low

gain control should be turned to maximum

10 cm radar should be placed on standby or turned off

radar should be stabilized, head up

The signal from a Ramark will show on the PPI as a .

radial line from the transponder to the center of the PPI

coded signal on the same bearing and at a greater range then the transponder

circle surrounding the transponder

dashed circle at the same range as the transponder

When you turn on the fast time constant (differentiator) control of a radar it will .

reduce clutter over the entire PPI by shortening t

reduce the beam width to provide a map-like presentation for navigation

only suppress weak targets to a limited distance from the ship (sea clutter)

enhance weak target echoes and brighten them on the PPI

The radar control that shortens all echoes on the display and reduces clutter caused by rain or snow is the .

fast time constant (differentiator)

sensitivity time control (sea clutter control)

The radar control that reduces weak echoes out to a limited distance from the ship is the .

sensitivity time control (sea-clutter control)

fast time constant (differentiator)

You have been observing your radar screen and notice that a contact on the screen has remained in the same position, relative to you, for several minutes. Your vessel is making 10 knots through the water. Which statement is TRUE?

The contact is on the same course and speed as your vessel.

The radar is showing false echoes and is probably defective.

The contact is on a reciprocal course at the same speed as your vessel.

The contact is dead in the water.

A navigator fixing a vessel's position by radar ________.

can use a radar bearing and distance from one object to fix the position

should never under any circumstances use radar bearings

should only use radar bearings when the range exceeds the distance to the horizon

must use information from forward of the beam

What causes a blind sector on the radar scope?

Improper placement of the indicator

What would give the best radar echo?

The beam of a three masted sailing vessel with all sails set.

A 110-foot fishing vessel with a radar reflector in its rigging.

A radar contact will remain stationary on a relative motion radar display only when it is .

on the same course and speed as your vessel

on the same course as your vessel

at the same speed as your vessel

on a reciprocal course at the same speed as your vessel

The closest point of approach (CPA) of a contact on a relative motion radar may be determined

after the contact has been marked at least twice

immediately when the contact is noted on radar

only if the radar scope is watched constantly

by an occasional glance at the radar

With Radar it's possible to do all of the following EXCEPT?

Determine the direction of objects

Recognize characteristics of the contact

Which general statement concerning radar is FALSE?

The ability of radar to detect objects is unaffected by weather conditions.

Raising the antenna height increases the radar range.

Radar bearings are less accurate than radar ranges.

Radar should be checked regularly during clear weather to ensure that it is operating properly.

A large contact with extremely fuzzy edges that is moving slowly on the scope may be a?

Group of ships traveling in a convoy

What would most likely prevent a SART's signal from being detected?

The rescue personnel were monitoring the 10-cm radar

Signal absorption by the ionosphere

The rescue personnel were monitoring the 3-cm radar

How can a SART's effective range be maximized?

The SART should be held as high as possible.

The SART should be placed in water immediately upon activation.

Switch the SART into the "high" power position.

If possible, the SART should be mounted horizontally so that its signal matches that of the searching radar signal.

Radar Observer Unlimited - Theory Questions

Authored by Liam Murphy

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Radar Observer Unlimited - Theory Questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The description "RACON" beside an illustration on a chart would mean a _________.

radar conspicuous beacon

circular radio beacon

radar calibration beacon

radar transponder beacon

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Your radar has a beam width of 2°. The radar gyro bearing of the right tangent of an island is 316°. The gyro error is 1°E. Which true bearing should be plotted on the chart?

313°

314°

316°

317°

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Coral atolls, or a chain of islands at right angles to the radar beam, may show as a long line rather than as individual targets due to __________.

the pulse length of the radar

limitations on range resolution

the multiple-target resolution factor

the effects of beam width

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

You are radar scanning for a buoy fitted with a RACON. In illustration D017NG below, which radar screen represents the presentation you should expect on the PPI?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A radar display which is oriented, so that north is always at the top of the screen, is called a(n) .

relative display

unstabilized display

stabilized display

composite display

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056°pgc. If the gyro error is 2°E, what bearing would you plot on the chart?

052°

056°

059°

060°

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Illustration D011NG below represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE?

A. A tangent bearing of the headland to the south-southeast should be corrected by adding one-half of the beam width.

B. Ship No. 1 is not detected due to the shadow effect of the headland.

C. The small island is not detected due to the effect of beam width.

D. Ship No. 2 is not detected due to the reflective mass of the background mountain overpowering the ship's reflective signals.

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Radar Observer Unlimited - Theory Questions

The description "RACON" beside an illustration on a chart would mean a _________.

Your radar has a beam width of 2°. The radar gyro bearing of the right tangent of an island is 316°. The gyro error is 1°E. Which true bearing should be plotted on the chart?

Coral atolls, or a chain of islands at right angles to the radar beam, may show as a long line rather than as individual targets due to __________.

You are radar scanning for a buoy fitted with a RACON. In illustration D017NG below, which radar screen represents the presentation you should expect on the PPI?

A radar display which is oriented, so that north is always at the top of the screen, is called a(n) .

The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056°pgc. If the gyro error is 2°E, what bearing would you plot on the chart?

Illustration D011NG below represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE?

You have another ship overtaking you close aboard to starboard. You have 3 radar targets bearing 090° relative at ranges of .5 mile, 1 mile, and 1.5 miles. In this case, the unwanted echoes are called .

An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer's vessel. Which of the following is NOT a characteristic of indirect echoes?

Illustration D011NG below represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE?

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