Your examiner asks: "Explain the difference between range discrimination and bearing discrimination, and give an example of each failing."

A. RANGE DISCRIMINATION is the ability to display two targets on the SAME bearing but at slightly DIFFERENT ranges as two separate echoes rather than one elongated blob — it is governed mainly by pulse length (a shorter pulse gives better range discrimination). Example of failure: two small vessels in line, one close behind the other on the same bearing, may merge into a single stretched echo on a long pulse setting. BEARING DISCRIMINATION is the ability to display two targets at the SAME range but slightly DIFFERENT bearings as two separate echoes — it is governed mainly by horizontal beam width (a narrower beam gives better bearing discrimination). Example of failure: two vessels close together side-by-side at the same range may merge into one broad echo if the horizontal beam width is not narrow enough to separate them.

B. Range discrimination and bearing discrimination mean the same thing and are used interchangeably to describe the radar's overall picture clarity.

C. Range discrimination depends on horizontal beam width, and bearing discrimination depends on pulse length — the reverse of the correct pairing.

D. Neither range nor bearing discrimination is affected by pulse length or beam width; both depend entirely on the display screen resolution (number of pixels).

A. Nothing — a test lift can proceed immediately after repairs

B. Testing should wait until cargo operations begin

C. The area within the grab's swing radius should be cleared of personnel before the lift

D. Only the crane operator needs to be aware the lift is happening

A. Who must remain clear of the exclusion zone while the lift takes place

B. The lunch schedule for the deck team

C. Only the weather forecast for the next watch

D. The cargo manifest for the next port