Your vessel is steady on a heading of 310° per standard magnetic compass when you sight Stratford Point Light and Igor I. Sikorsky Airport Aero Beacon in line dead ahead. What does this information indicate?
• Standard magnetic compass vs. true bearings and how to relate them using variation and deviation • How range marks (two charted objects in line) give you a precise true bearing • Difference between compass error, variation, and deviation and how they relate: CE = Var + Dev
• Look up the charted TRUE bearing of the line between Stratford Point Light and the Sikorsky Airport Aero Beacon. How does this compare to your COMPASS heading of 310°? • Once you find the difference between the compass heading and the true bearing, decide whether that difference is east or west, and whether it is called total compass error, variation, or deviation. • After identifying total compass error, think about what local variation is in that area and how that affects the deviation that your compass must have on this heading.
• Verify the charted true bearing of the range line between the light and the aero beacon. • Confirm the local magnetic variation from the chart for that area (including whether it is east or west). • Carefully apply the relationship Compass Error = Variation + Deviation and keep track of east/west signs before matching any of the choices.
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