🔍 Key Concepts

• Using a nautical chart to plot a GPS position and nearby buoy • Understanding abeam to starboard and how to draw a line of position 0.5 NM off the buoy • Converting from true course to per standard compass (psc) using variation and deviation

💭 Think About

• How would you plot your GPS position and the buoy "CF" on the chart, then draw a track that passes 0.5 NM off the buoy on your starboard side? • Once you measure the true course of that track, what corrections (variation, deviation) do you need to apply to convert it to a standard magnetic compass course? • Which answer choice best matches the course after applying all corrections carefully and checking that the buoy will be abeam, not ahead or astern?

✅ Before You Answer

• Verify the distance off from the buoy is exactly 0.5 NM on the chart, on the correct side (starboard). • Double‑check the variation and deviation used for this area and vessel, and apply them in the correct order (True–Magnetic–Compass). • Confirm that the resulting course will leave the buoy abeam (roughly 90° off your starboard beam) at the closest point of approach, not passing ahead or astern of it.