🔍 Key Concepts
• Differences between DR (dead reckoning), EP (estimated position), and a fix on a piloting plot
• How a running fix is constructed using two bearings to the same object at different times, with one line of position advanced
• Standard chart symbols: open circle, square, and circle-with-dot, and what each usually represents on a USCG exam plotting sheet
💭 Think About
• Look closely at how the position at C was obtained: is it from advancing a line of position from an earlier time, or from intersecting fresh, simultaneous observations?
• Compare the symbol used at C with the symbols at A, B, D, and E. Which one shows a pure DR track, which one shows an estimated position, and which ones come from observational lines of position?
• On the track line near C, notice the time labels (1030–1100). What does that tell you about how this particular position was determined?
✅ Before You Answer
• Identify which symbol on the sheet represents a DR position and which represents an estimated position before choosing your answer
• Confirm whether position C comes from simultaneous observations or from advancing a previous line of position to a later time
• Verify that your choice matches both the symbol used at C and the construction method (how the lines and times are drawn)