What instrument measures wind velocity?
A) Hydrometer B) Barometer C) Psychrometer D) Anemometer E)NULL
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You are on course 355°T and take a relative bearing of a lighthouse of 275°. What is the true bearing of the lighthouse?
A) 080° B) 085° C) 280° D) 270° E)NULL
Spoil grounds, anchorage areas, cable areas, and military exercise areas are all marked by yellow buoys. Which special mark on the buoy will indicate the specific area you are in?
A) A topmark triangular in shape B) A topmark spherical in shape C) Lettering on the buoy D) A topmark consisting of two cones with the points up E)NULL
Referring to illustration D049NG, which wind speeds is reported in position C?
A) 3 knots B) 10 knots C) 20 knots D) 30 knots E)NULL
The magnetic compass error which changes with the geographical location of your vessel is called __________.?
A) deviation B) variation C) compensation D) differentiation E)NULL
You are plotting a running fix. How many fixed objects are needed to take your lines of position from?
A) One B) Two C) Three D) None E)NULL
The prime vertical is the great circle on the celestial sphere that passes through the __________.?
A) celestial poles and the zenith B) zenith, nadir and the east point of the horizon C) celestial poles and the celestial body D) zenith, nadir and celestial body E)NULL
The period at high or low tide during which there is no change in the height of the water is called the __________.?
A) range of the tide B) plane of the tide C) stand of the tide D) reversing of the tide E)NULL
On 16 January 1981, you take a sight of a star. The sextant altitude (hs) is 4°33.0′. The temperature is -10°C, and the barometer reads 992 millibars. The height of eye is 42 feet. The index error is 1.9′ off the arc. What is the observed altitude (Ho)?
A) 4°10.2′ B) 4°14.3′ C) 4°17.0′ D) 4°24.1′ E)NULL
The magnitude of three stars is indicated. Which star is the brightest?
A) Canopus – 0.9 B) Vega + 0.1 C) Antares + 1.2 D) Cannot be determined; magnitude indicates size not brightness E)NULL