VTS Navigation Systems 3

Question 1

What is radar clutter and how does it affect VTS operations?

Accepted Answer

Unwanted returns from rain, sea, or land that can mask vessel targets

Answer

Radar clutter is unwanted echoes from precipitation, sea waves, or land that can obscure real vessel targets and reduce detection reliability.

Question 2

In a VTS system, what does 'ARPA' provide that basic radar does not?

Accepted Answer

Automatic tracking and CPA/TCPA calculation for radar targets

Answer

ARPA (Automatic Radar Plotting Aid) automatically tracks targets and calculates Closest Point of Approach (CPA) and Time to CPA (TCPA) to assess collision risk.

Question 3

When a VTS operator uses a 'range ring' on a radar display, what is its primary purpose?

Accepted Answer

To measure the distance of a target from the radar antenna

Answer

Range rings are concentric circles on the radar display that allow the operator to quickly estimate the distance of targets from the radar site.

Question 4

Which chart datum is most commonly used in U.S. coastal navigation and VTS charting?

Accepted Answer

Mean Lower Low Water (MLLW)

Answer

In the United States, Mean Lower Low Water (MLLW) is the standard tidal datum used for nautical charts and depth references.

Question 5

A vessel reports 'ETA 1430 local time' but AIS data shows arrival in 2 hours from now at 1600. What should the VTS operator do?

Accepted Answer

Verify the discrepancy by contacting the vessel for updated ETA

Answer

Conflicting ETA information between voice reports and AIS requires the operator to contact the vessel directly to resolve the discrepancy.

(VTS) Vessel Traffic Services Operator Exam Practice Test

(VTS) Vessel Traffic Services Operator Exam Practice Test

VTS Navigation Systems 3