1 Quiz Q & A Junior Navigation Chapter 12 Wind & Current

2 1. You determine a fix at You start a new leg of a DR plot from your 0500 fix. At 1600 you determine another fix and plot both the 1600 DR position and the 1600 fix. You notice that these two 1600 positions are 7.5 nautical miles apart. List at least three factors that may have contributed to this difference between the two positions. Current Leeway Wave Action Steering Error Dead Reckoning Error

3 2. Two vessels depart from the same position at approximately the same time. Vessel A is a 46- foot diesel-powered trawler running at 10 knots. Vessel B is a 52-foot ketch under sail running at 4 knots. Wind is on the beam of both vessels. Both captains desire to follow the same course made good. Which vessel will probably require the larger allowance for leeway? Vessel B

4 3. You wish to sail from Ft. Lauderdale, Fla., to the Bahama Islands and determine the intended track to be 090 ° T. You estimate that the northward-flowing current will produce a drift angle of 12° and the northwest wind will produce a leeway of 2°. What should your true steering course be? 100°T

5 4. You are in a sailboat, trying to maintain an average course to windward. Your boat cannot point higher than 45° to the wind. To try to generally follow a rhumb line, you tack at about one-half hour intervals. You determine a fix at 0800 and a second fix at The fixes are 40 nautical miles apart. Which of the following statements is true? a. Speed has been 5 knots. b. Speed of advance has been 5 knots. c. Speed over ground has been 5 knots. d. Speed made good has been 5 knots.

6 5. You determine a fix and maintain a steering course of 270°T from the fix. Four hours later, you determine a second fix and find the course made good was 275°T. Assuming that current and wind remain constant and your intended track is 270°T, your new steering course should be 265°T. a. True b. False

7Q7 End Of Quiz Q & A Junior Navigation Chapter 12 Wind & Current