Three-Point Bearing Plotting | Three Bearings of Same Object | Marine Navigation | Chief Mate 🚢

Описание: Three-Point Bearing Plotting | Three Bearings of Same Object | Marine Navigation | Chief Mate 🚢
This video explains the Three-Point Bearing Plotting Method (also called Three Bearings of the Same Object) — one of the most important concepts in marine navigation for Chief Mate, Second Mate, and Deck Officer exams.

This method helps you determine:
• Course Made Good (CMG)
• Speed Made Good
• Ship’s position at all three observation times
🧭 What Data is Given in Exam Questions
• Three true bearings of the same object
• Time intervals OR distances run between bearings
• Wind direction and leeway (if given)
• Any three of the following:
– Compass course steered
– Engine speed
– Set of current
– Rate of current
✍️ Step-by-Step Plot You’ll Learn
1️⃣ Draw true bearing lines from the object
2️⃣ Calculate ratio of time / distance between observations
3️⃣ Draw a reference line through the object keeping all bearings on one side
4️⃣ Mark distances A and B based on the ratio
5️⃣ Draw parallels to the middle bearing to get points C and D
6️⃣ Join C–D → this gives direction of CMG
7️⃣ Construct vector triangle (course + leeway + current)
8️⃣ Measure CF to get Distance Made Good / Speed Made Good
9️⃣ Transfer bearing lines to locate final position
🔟 Plot P, Q, R — ship’s positions at each observation
By the end, you will clearly understand how CMG, current, and ship position are determined from bearings on a chart.
🎯 Best For
✔ Chief Mate exam preparation
✔ Second Mate candidates
✔ Cadets learning chartwork
✔ Anyone revising vector triangle problems
Clear plotting + logical reasoning = full marks in exams.

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Plotting current set and drift
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Three point fix navigation
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Leeway and current plotting
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