At 2310 your position is LAT 41°05.5'N, LONG...

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Question 1 of 2066636eea28f7522a1c51ad6f

At 2310 your position is LAT 41°05.5'N, LONG 72°33.7'W and you change course to make good 068°T. A radar speed check using Twenty Eight Foot Shoal Buoy indicates your speed over the ground is 13.6 knots. At 2325 Horton Point Light bears 129°T. At 2341 the same light bears 194°T. What is the position of your 2341 running fix?

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🔍 Key Concepts

• Running fix using two bearings to the same object with known course and speed between them • Converting course and speed over ground into a run (distance made good) between bearings • Plotting lines of position (LOPs) from true bearings and advancing or retarding them

💭 Think About

• How much time passes between the first and second bearing of Horton Point Light, and what distance over the ground do you cover in that time at 13.6 knots? • When you plot the first bearing of Horton Point Light, do you advance that LOP forward to the time of the second bearing, or do you move the second one back? Why? • After you construct the running fix, which latitude and longitude choice lies closest to that intersection on the chart, considering your general track of 068°T from the starting position?

✅ Before You Answer

• Be sure you are using speed over ground (SOG), not speed through the water, to compute distance between bearings. • Verify you are plotting true bearings from the object to the vessel correctly on the chart (remember how the bearing is stated: from the ship to the light). • Double‑check that the final running fix lies along a reasonable progression from your 2310 position given your course made good 068°T and elapsed time.

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