In the celestial equator system of coordinates what is equivalent to the colatitude of the Earth system of coordinates?
A) Coaltitude B) Zenith distance C) Polar distance D) Declination E)NULL
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In the North Sea area, you sight a buoy with a quick light showing 3 flashes every 10 seconds. Which topmark in illustration D030NG would be fitted to this buoy under the IALA Buoyage Systems?
A) A B) B C) C D) D E)NULL
In illustration D051NG, the position labeled C was plotted because __________.?
A) running fixes are better estimates of true position than dead-reckoning positions are B) the vessel’s course changed from due North to due East C) the vessel’s speed changed D) All of the above are correct E)NULL
The height of eye correction is smaller than geometrical dip because of __________.?
A) the angle between the horizontal and the line of sight to the visible horizon B) index error C) parallax D) terrestrial refraction E)NULL
You are enroute to Savannah, GA, from Recife, Brazil. There is a strong N’ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________.?
A) smoother seas and warmer water B) long swells C) steeper waves, closer together D) cirrus clouds E)NULL
Planetary aberration is due, in part, to __________.?
A) refraction of light as it enters the Earth’s atmosphere B) rotation of the Earth on it’s axis C) the body’s orbital motion during the time required for its light to reach Earth D) a false horizon E)NULL
You are downbound approaching a lock and see 3 green lights in a vertical line. This indicates __________.?
A) that the lock chamber is open and ready to receive your tow B) that you should hold up until the signal changes to 2 green lights C) the upstream end of the river wall D) the upstream end of…
What is a lighted safe water mark fitted with to aid in its identification?
A) A spherical topmark B) Red and white retroreflective material C) A sequential number D) A red and white octagon E)NULL
All persons or vessels within the lock area, including the lock approach channels, come under the authority of the __________.?
A) dockmaster B) dock captain C) lockmaster D) lock foreman E)NULL
A great circle crosses the equator at 93°W. It will also cross the equator at what other longitude?
A) 13°E B) 87°E C) 177°E D) 177°W E)NULL