Sailing Navigation Tips - How to Find Your Position by "EP" 44 0

Sailing 7 years ago 2,160 views

Visit http://www.skippertips.com for more boating safety and sailing tips like these. You approach the narrow entrance to an anchorage and need a fast, easy way to confirm the GPS. How can you use a bearing to a single object to do this? Watch the sailing video to find the answer. Captain John with 25+ years of experience shows you the no-nonsense cruising skills you need for safer sailing worldwide. Visit his website at https://www.skippertips.com and sign up for his highly popular Sailing Tip of the Week. Discover how you can gain instant access to hundreds of sailing articles, videos, FREE e-Books and much more!

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dernamenervt - 7 years ago

What about magnetic deviation and variation before drawing?

Captain John's Skipper Tips - 7 years ago

In the illustration, compass error has already been applied to the course and bearing. If you decide to change course (in this case, to the right), use variation and deviation again to find the new compass course to steer.

Wilfred Darr - 7 years ago

Just a question, but does this not give an ambiguous answer? Looking at the example, the current is from the front starboard: but say the current is a little stronger, from the front port, would you not still end up on the same bearing to SPIRE, but right of your estimated track line instead? Does this method eliminate the ambiguous answer and if so how…what am I missing here? Frankly, with an unknown current/wind couldn't you solve this to be anywhere on that line? I'll take another look at this in the morning and see if it makes sense… and Tuesday when I have some time I might just break out the graphing paper.

Wilfred Darr - 7 years ago

Captain John's Skipper Tips Ahhhhhh. I see, that makes a lot more sense. thanks for clarifying.

Captain John's Skipper Tips - 7 years ago

Wilfred, the current will push you to one side or another of the sailing track. You are somewhere along that LOP at the time that you took the bearing. The EP is plotted at the closest point to the DR (thus the perpendicular). The more accurate the DR, the more reliable the EP (and vice versa). This example shows just the first step with EPs. You can apply all kinds of other variables if you have them (i.e. known tidal current direction and strength).

hux Jones - 7 years ago

thanks!

About Sailing Navigation Tips - How to Find Your Position by "EP"

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