Great Circle Sailing and Gnomonic Charts

This video explains the concept of great circle sailing and gnomonic charts. Most importantly, it also distinguishes the sailing and chart from mercator sailing (rhumb line) and charts.

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Contents of this video will benefit mariners preparing for exams (written and oral examinations).
Mariners will also benefit by watching the following videos:
Great circle sailing:    • Great Circle Sailing Calculation - wi...  
Determining the final (and Initial) course angle:    • How to determine the Final (and Initi...  
Composite great circle sailing:    • Composite Great Circle Sailing - Ocea...  
Calculate departure along a parallel of latitude:    • How to calculate departure (along a p...  
Calculate d’lat and d’long (Plane sailing):    • How to Calculate D'lat and D'long - P...  
D’lat and m’lat calculation:    • Clear your confusion about d'lat and ...  
Plane sailing (example 1):    • How to calculate course and distance ...  
Mercator sailing (Example 1):    • How to solve Mercator sailing calcula...  
Calculate mean latitude:    • How to calculate mean latitude or m'lat  
A trick to remembering formulas in sailings:    • A simple trick to remember the formul...  
Compare plane sailing to mercator sailing:    • How to compare Plane Sailing to Merca...  
Day’s work (wind and leeway):    • Day's Work  - with effect of wind and...  
Horizontal sextant angles:    • Using horizontal sextant angles to pl...  
The use of position lines:    • Coastal Navigation - The use of posit...  
Rising and dipping of lights:    • Rising and dipping of lights at sea -...  
Horizontal angles:    • Horizontal angles - Plotting ship's p...  
Compass error:    • Compass Error Calculation - Coastal N...  
Tidal window calculations:    • Tidal window calculations - Tides (Co...  
Secondary port tide calculations:    • Secondary Port Tide Calculation - Tid...  
Explaining interpolation of second port tide calculation:    • Explaining the interpolation for Seco...  
Simplified harmonic method of tide calculation:    • Simplified Harmonic Method Of Tide Ca...  
Simplified harmonic method (Theory):    • Simple harmonic method - Tide Calcula...  
PZX triangle:    • PZX triangle Rational Horizon diagram...  
Venus as morning or evening star:    • Why Venus is known as the morning and...  
Circumpolar bodies (Theory):    • Circumpolar Bodies Celestial Navigati...  
Circumpolar bodies (worked example):    • Circumpolar Bodies - Worked Example 1  
Back angle of sextant:    • Back Angles of a Sextant - what is it...  
Using back angle (Meridian Passage):    • Using the back angle of  Sun's altitu...  
Information on paper charts:    • Information on Paper Charts used on s...  
DR and fix position, effects of wind and current, set and drift:    • Chartwork on ships - DR and fix posit...  
Running Fix (Transferring position lines):    • Chartwork on ships - Running Fix (Tra...  
Tidal diamonds:    • Chartwork for deck officers - What ar...  
Finding the course to steer to counteract tidal currents:    • Chartwork for seafarers - Finding the...  
Basic terms, terminology, and symbols:    • Chartwork - Basic terms, terminology ...  
Allowing for the effect of wind and current on ship’s course and speed:    • Chartwork - Allowing for the leeway (...  
Counteracting for the effect of current and leeway to determine the course to steer:    • Chartwork - Determining the courses t...  
The use of position lines -    • Coastal Navigation - The use of posit...  
Rising and dipping of lights:    • Rising and dipping of lights at sea -...  
Tides General Theory:    • Tides - General theory (Coastal Navig...  
Secondary port tide calculation:    • Secondary Port Tide Calculation - Tid...  
Tidal window calculations:    • Tidal window calculations - Tides (Co...  
Explaining the interpolation in secondary port tide calculation:    • Explaining the interpolation for Seco...  
Mercator charts and sailings:    • Mercator Charts and Sailings - Coasta...