Position Circles in Chart Work — Radar Ranges, Vertical Angles & VSA index error | Mates MMD Exam

Описание: This lecture explains Position Circles in Chart Work — what they are, how they are obtained, and how to plot them correctly on a nautical chart.
You will learn:
• What a position circle represents on a chart
• How radar ranges are used to plot circles accurately
• How Vertical Sextant Angle (VSA) helps determine distance
• Correcting height for tide and index error
• Practical plotting examples used in real navigation
Position circles are an essential concept for 2nd Mate, Chief Mate and MMD exams, and equally important for safe watchkeeping at sea.
If you’re preparing for exams or want to strengthen your navigation basics, this session will help you understand the concept step-by-step.
📌 Topics covered:
Position Circle • Radar Range • Vertical Sextant Angle (VSA) • Index Error • Tide Correction • Chart Work Navigation
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🔖 TAGS
Position circle
Chart work navigation
Radar range plotting
Vertical sextant angle
VSA calculation
Nautical chart plotting
Chief mate exam
2nd mate exam
MMD navigation
Position fixing at sea
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