ELECTRONIC NAVIGATION

A measure of the time that the radar indicator (PPI scope) retains images of echoes is called:

• pulse repetition

• resolution

• persistence

• recurrence rate

Radar range in fog will, generally speaking:

• be no different

• be greater than in clear weather

• be useless because of its inaccuracy

• be less than in clear weather

The radar range scale to use in the open sea when no other vessels are around or when there is no expectation of making a landfall is:

• short

• medium

• maximum with periodic shifting to medium

• maximum

The magnetron is:

• a receiving tube

• a receiver

• a transmitting tube

• a detector

The most accurate position by radar fix is:

• radar range and visual bearing

• the intersection of two radar bearings

• radar range and radar bearing

• two radar ranges

when the range of a ship is decreasing and its bearing remains constant, the ships are on:

• opposite course

• diverging course

• collision course

• parallel course

The number of pulses transmitted per second by a radar transmitter is known as:

• frequency of transmission

• pulse repetition rate

• pulse transmission

• pulse characteristics

What condition indicates that your radar needs maintenance?

• serrated range rings

• multiple echoes

• blind sector

• indirect echoes

Your radar is set on a true motion display. Which of the following will not appear to move across the PPI scope?

• own ship marker

• echoes from land masses

• echoes from a ship at anchor

• all of the answers are correct

Antenna maintenance of a radar should include:

• painting of scanner

• checking oil level

• cleaning window on horn

• all of the above