chart work

Distance

Nautical Mile/One Minute of Latitude We know that we measure in degrees (°), minutes (’) and seconds (ʺ)  or decimals of a minute. One minute of latitude is equal to one nautical mile (1,852 metres or 1.852 kilometres). TIP: You MUST measure distance from the latitude scale adjacent to the area you are working in …

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Degrees, Minutes, and Seconds – Decimalise Example

Conversions If you are calculating the time you will arrive at your destination, you would use the Speed, Distance, Time formula. To enable the use of a calculator we must convert the minutes (or seconds as per the example) to a decimal. Once calculated, the navigator would not say, “We will arrive in 3.5 hours, …

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Latitude and Longitude

Writing latitude and longitude correctly is extremely important. The next person on watch must be able to read and understand what you have written on the chart and in the log book. Latitude should always be written first (in some areas in the USA longitude is written first, latitude first is more widely accepted): E.g.                         …

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The Great Circle

The Great Circle is the largest circle that can be drawn around the Earth’s sphere. When cutting a sphere exactly in half you have cut along one of its great circles. All Meridians are great circles. The Equator is a great circle (i.e. cutting the Earth in half). Great circles are useful in planning routes …

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Latitude

What do the Co-ordinates Mean? To find an exact position on Earth we must have two coordinates: Latitude and Longitude. Latitude and longitude are the lines that are drawn on charts (and maps). It is standard practice (and easier) to decimalise the minutes in order to use formulas for navigation. Latitude The equator: An imaginary …

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Where on Earth are we?

More importantly, what does that mean? Navigation is basically the art of determining where you are and what direction and distance you must go. Therefore, we must learn to find out where we are and what that means for us. We do this by understanding the nautical chart, plotting our position, and laying off direction …

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Navigation Tool Kit

A SisterShip Training Pouch with everything you need   A stylish SisterShip pouch to hold all your chart work tools. Left sliding around in your nav station draw they can quickly become damaged and scratched. The pouch contains: Portland plotter, brass dividers, pencil compass, pencils, eraser, sharpener –  all in one handy, protective, custom-made, (and …

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Introduction to Coastal Navigation Course

Calling all boaters SisterShip/Partnership Training is coming to Moreton Bay AND Sydney AND Port Stephens Moreton Bay: 21st and 22nd September at the stunning Moreton Bay Trailer Boat Club: 34 Fairlead Cres, Manly QLD 4179 2. Sydney: 12th and 13th October at Pantaenius Sail and Motor Yacht Insurance,  33/6 Jubilee Ave, Warriewood NSW 2102 3. Port …

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The Best Navigation Course Available – so they say!

With half a dozen courses under our belts – the testimonials are rolling in. Here’s our favourite! “Last week, I completed my five day RYA Day Skipper Practical with EastSail in Sydney. They say it is a prerequisite to have done their ten-week RYA Day Skipper shore-based course but I decided to sign up regardless. …

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