🔍 Key Concepts

• Definition of advance in a turning circle (distance gained in the original direction of travel from rudder order until a specified change of heading) • How to plot ship’s positions from radar range and bearing of a fixed light to get the turning path • Estimating where on the track the ship has changed heading by 90° from the original 333° course

💭 Think About

• From the table, at what heading is the rudder put hard over, and which recorded positions occur just before and just after a 90° change from 333°? • If you plot the ship’s positions relative to the light, how do you project the point of 90° heading change back onto the original course line to read off the advance distance? • When you interpolate between the two headings bracketing the 90° change, how does that affect the distance you choose among the multiple‑choice answers?

✅ Before You Answer

• Be clear that advance is measured along the original course line, not along the curved track or perpendicular to it • Confirm the initial heading (333°) and therefore the exact heading that represents a 90° change (turning to about 243°) • Identify which two plotted points surround the 90° heading and interpolate between them before measuring distance along the original course