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Question 1 of 2066636ee928f7522a1c5197ab

The following questions are to be answered using Chart 12221TR, Chesapeake Bay Entrance, and supporting publications. You are southbound along the coast on a course of 180°T and the engine speed is 14 knots. Your draft is 16 feet. Gyro error is 2°W. Use 10°W variation where required At 2000 Hog Island Lighted Bell Buoy "12" bears 199°T and Buoy "GM" bears 249°T. What is your position?

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Question 1 of 20

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🔍 Key Concepts

• Two-bearing visual fix on a chart using aids to navigation (buoys/lights) • Difference between true bearings and what you plot from your vessel to the aid (reciprocal bearings) • How to rule out impossible positions by comparing lat/long of choices with where Hog Island and Buoy "GM" actually are on Chart 12221TR

💭 Think About

• When a buoy bears 199°T from your vessel, what is the reciprocal bearing from the buoy to your vessel that you actually plot on the chart? Do the same for the 249°T bearing to Buoy "GM". • After plotting the two reciprocal lines of position (LOPs), where should their intersection fall in relation to Hog Island and Bouy "GM" on the chart (in general terms: north/south, inshore/offshore)? • Compare each answer’s latitude and longitude with your plotted fix area. Which options are clearly in the wrong general area compared with the intersection of your two LOPs?

✅ Before You Answer

• Be sure to convert vessel-to-buoy bearings to buoy-to-vessel bearings (reciprocal bearings) before plotting. • Confirm you are plotting true bearings directly on the chart (no gyro or variation corrections needed because the problem already gives true). • Check that the fix you get is reasonable relative to the coastline and depth contours—you shouldn’t end up on land or far outside the area where those two buoys can both be seen as given.

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