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How to Calculate Tidal Flows using an Almanac and Tidal Stream Atlas

24/1/2021

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In this video, we talk you through how to calculate tidal flow rate and direction using a tidal atlas and the tide tables in the 2020 Reeds Tidal Almanac. 
Tidal Atlas for the Solent for Sale
Tidal Atlas for the Solent
Reeds 2021 Channel Almanac
Reeds Channel Almanac 2021
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How to Measure distance on a Mercator Chart using Dividers and the Latitude Scale

24/1/2021

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Portland Plotter & Divider Kit
One degree of latitude is equal to 60 nautical miles. There are 60 minutes in a degree of latitude, with one minute being equal to one nautical mile. 

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How to calculate today's variation on an older paper Chart

22/1/2021

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In other articles, we talked about how we apply variation and deviation. In this article we explain how we establish variation on an older paper chart where variation has been changing over time.
This video explains how you calculate variation in any given year on an older chart. If you want to know how to apply variation, click here.

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Complete Day Skipper Book by Tom Cunliffe
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How to create a Bullet Proof Passage Plan every time!

13/10/2020

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​Preparing a passage plan is no more than a formal visualisation of the voyage you intend to take. And in familiar waters, simply running through the passage in your head is a great way to highlight specific issues or potential areas that require more consideration and/or preparation.

That said, making a more formal plan and actually writing it down helps you to establish what information needs to be collated and helps you to identify hazards and risks and summarise and distil relevant and important data. 

We all know from our school days, putting things down on paper helps us to crystallise our thoughts as well as highlighting our ‘workings’! Also, if things do go wrong, having evidence of a carefully prepared passage plan can be very useful - especially if the insurance company or the authorities become involved! 

Under SOLAS V Regulations, there is now a legal requirement for the skipper going to sea to compile a passage plan. We can all get into difficulties at sea, so planning to avoid as many pitfalls as possible is just common sense. 

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How to Calculate Tidal Heights in a Standard Port

28/8/2020

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How to apply variation & deviation to a course or bearing

8/6/2020

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How to maintain a ships log & why

8/6/2020

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How to plot a dead-reckoned position on a paper chart

8/6/2020

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How to plot a GPS-derived fix onto a paper chart

8/6/2020

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The Admiralty mercator chart - The Basics

10/2/2020

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For a map to be useful in helping to navigate and plan a voyage (us sailors call them charts) it must be properly understood and be accurate for its purpose.  Charts are physical (or electronic) representations of the physical characteristics of the earth & the water on it. They are a projection of a curved surface (the earth) onto a flat one (such as a sheet of paper or computer screen).
It's necessary to make some adjustments to how this information is presented so that this projection can be done whilst still making it a useful and navigationally accurate representation of the surface of this spherical planet.
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  • FREE Videos
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