What is the predicted velocity of the tidal current 2 miles west of Southwest Ledge for 2330 DST (ZD +4) on 7 September 1983?
A) 1.3 knots B) 1.6 knots C) 1.9 knots D) 2.2 knots E)NULL
Soru Kategorisi Güverte
In shallow water, waves that are too steep to be stable, causing the crests to move forward faster than the rest of the wave, are called __________.?
A) rollers B) breakers C) white caps D) surfers E)NULL
When daylight savings time is kept, the time of tide and current calculations must be adjusted. One way of doing this is to __________.?
A) add one hour to the times listed under the reference stations B) subtract one hour from the time differences listed for the subordinate stations C) apply no correction as the times in the reference stations are adjusted for daylight…
You are on course 030°T. The relative bearing of a lighthouse is 45°. What is the true bearing?
A) 015° B) 075° C) 255° D) 345° E)NULL
You are ascending a river and exchanging navigational information via radiotelephone with a descending vessel. If the descending vessel advises you to “watch for the set” above point X, what would you expect to encounter above point X?
A) An increase in current velocity B) Slack water C) Shallow water D) A sideways movement of your vessel E)NULL
The West Wind Drift is located __________.?
A) near 60°S B) on each side of the Equatorial Current C) in the North Atlantic between Greenland and Europe D) in the South Pacific near 5°S E)NULL
The apparent wind can be zero when the true wind is from __________.?
A) ahead and equal to the ship’s speed B) astern and equal to the ship’s speed C) ahead and equal to twice the ship’s speed D) astern and equal to twice the ship’s speed E)NULL
90° – Ho = __________.?
A) sextant altitude B) co-latitude C) LHA D) zenith distance E)NULL
The length of a wave is the length __________.?
A) of the wave’s crest B) of the wave’s trough C) measured from crest to trough D) measured from crest to crest E)NULL
The wind flow from the horse latitudes to the doldrums is deflected due to __________.?
A) Coriolis force B) the mid-latitude, semi-permanent high C) differing atmospheric pressures D) the prevailing westerlies E)NULL