Your position is LAT 37°00.0'N, LONG 75°30.0'W. What is the course to steer per standard magnetic compass to arrive at LAT 36°59.0'N, LONG 75°48.5'W, if you are turning for 7.8 knots, the current is 139°T at 1.3 knots, and a northwesterly wind is causing 3° of leeway?
• Plotting a current vector using set and drift • Applying leeway to the final course through the water • Converting from true course to compass course using variation and deviation
• What is the line of position (track line) between the two given coordinates, and what is the true course along that line before you consider current or wind? • How do you combine the ship’s speed through the water and the current vector (set and drift) to find the necessary course to make good the desired track? • Once you have the course to steer through the water and have adjusted for leeway, how do you step-by-step convert from true to magnetic to standard compass? What information do you need for this conversion?
• Be sure you are using speed through the water (7.8 knots) against the current (1.3 knots), not adding speeds directly along the track • Confirm you applied the current vector over 1 hour or the correct time interval based on distance and speed, not just direction alone • Double-check each angle conversion: true → magnetic → compass, and confirm whether leeway is added or subtracted based on the wind coming from the northwest.
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