A) enter the riverward lock B) hold position until two more upbound tows have locked through C) enter the landward lock D) hold position until the lower gates are closed E)NULL
A) preferred-channel buoys B) starboard- or port-side buoys C) special marks D) safe water buoys E)NULL
A) Wind rapidly changing direction B) A temperature much lower than that outside the eye C) Towering cumulonimbus clouds D) An extremely low barometric pressure E)NULL
A) altitude circle B) vertical circle C) diurnal circle D) hour circle E)NULL
A) informational buoy B) junction buoy C) safe water buoy D) All of the above E)NULL
A) wingdam B) towhead C) cutoff D) landwall E)NULL
A) movement of the points of intersection of the planes of the ecliptic and the equator B) apparent westerly motion of a planet with respect to stars C) movement of a superior planet in its orbit about the Sun D)…
A) must pass south of the buoy B) must pass north of the buoy C) should pass well clear on either side of the buoy D) must pass the buoy close to starboard E)NULL
A) adding 30° of arc to the sight B) using a dip correction based on the height of eye above the ice C) doubling the semidiameter correction D) using a dip correction from table 22 in Bowditch Vol. II E)NULL
A) high barometric pressure B) low barometric pressure C) steady barometric pressure D) changing barometric pressure E)NULL