At 0112, the radar range to Branford Reef...

Question 1 of 31048fork_4575abb2139346cebf0

At 0112, the radar range to Branford Reef Light is 2.9 miles. At 0125, the range is 3.6 miles. What is the position of your 0125 running fix if you are steering 124°T at 12 knots?

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Question 1 of 31048

At 0112, the radar range to Branford Reef Light is 2.9 miles. At 0125, the range is 3.6 miles. What is the position of your 0125 running fix if you are steering 124°T at 12 knots?

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🔍 Key Concepts

• Start from the 0112 fix in step 6, LAT 41°11.4′N, LONG 72°51.3′W. A radar range supplies a circular line of position centered on Branford Reef Light; advance the earlier circle to the later observation time. • Steering course is not necessarily course over ground. Advancing on 124°T at 12 knots assumes no current allowance. If the current from step 8 continues, use the resultant ground motion instead. • The illustration is a magnetic-heading deviation table, not the chart. Since the course is given in true degrees, no variation or deviation conversion is needed.

💭 Think About

• Draw the 2.9-nautical-mile range circle at 0112 and the 3.6-nautical-mile circle at 0125. How can you translate the earlier circle’s center by the vessel’s displacement so that both lines of position refer to 0125? • The interval is 13 minutes. For the apparent no-current keyed construction, use $D=12\,\text{NM/h}\times(13/60)\,\text{h}=2.6\,\text{NM}$ along 124°T. If the step 8 current persists, compare that with approximately 128.6°T at 11.25 knots: $D=11.25\,\text{NM/h}\times(13/60)\,\text{h}\approx2.44\,\text{NM}$ . How does that change the advanced circle? • Which intersection of the advanced earlier circle and the unshifted later circle is consistent with the step 6 fix and subsequent southeastward travel?

✅ Before You Answer

• Shift only the earlier range circle; keep the 0125 circle centered on Branford Reef Light. Read the selected intersection using the chart’s latitude and longitude scales. • State the current assumption. Distinguish the apparent no-current keyed construction from the current-inclusive construction; do not assume that steering 124°T establishes ground motion or automatically discard the step 8 current. • Use Chart 12354TR, not the attached deviation table, for the actual plot and distance measurements.