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TVMDC Explained

  TVMDC is a kind of acronym known as a mnemonic initialism. It’s an easy to remember abbreviation word. That means each letter in the acronym stands for the first word in a longer term. It stands for true heading, variation, magnetic heading, deviation, compass heading. Sometimes it will be called true variation magnetic deviation…

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Distance, Speed, Time Worksheet

Coastal Navigation Course Chapter VI Distance, Speed, Time Worksheet Remember: Convert Minutes to Decimals (and back) and Round Answers Distance: Speed: Time: 1. 15.0 nm 8.6 1 hour 45 minutes = 1.75 hours Calculation: D ÷ T = S – 15.0 nm ÷ 1.75 hours = 8.57 kts 2. 12.5 nm 7 kts 1 hour 47…

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Heading vs Course vs Bearing

How many times have you heard someone discuss where they’re going in a boat and drop the words heading or bearing or course or track? We’re on track to the marina. We’re on a heading due south. On a course to meet a friend. Bearing north at 12 knots. Whatever it might be, they’re generally…

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How to use dividers

Navigation Tools How to use dividers Using dividers and the latitude scale on your nautical chart, you are able to measure distance in nautical miles. (Remember, do not use longitudes to measure distance. Longitude lines converge at the poles and the distance between them changes relative to your position on the earth.) One minute equals…

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How to use parallel rulers

How to use parallel rulers Parallel rulers are used to plot direction on your nautical chart. They are, essentially, two straight-edges hinged so that they maintain the same angle. By alternating the moving edge, and securely holding down the non-moving edge, you can move the rulers about the chart while still maintaining the same angle….

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