The answers to the exercises from Sea Kayak Navigation (second edition) are now up online at www.pesdapress.com/answers.
We ‘re also considering adding the diagrams and illustrations from the book to our Resources area on the website. You can already find the images from White Water Safety & Rescue there, resized and watermarked for you to use in your own presentations. If you think the same sort of thing would be useful for Sea Kayak Navigation, then please post a comment below on this thread.
Dear Pesda,
That would be mostly appreciated.
Great idea. I will use it
Martin
It would be very useful indeed especially with the advent of the BCU Coastal and Open Water Navigation courses
A very good idea
Franco,
Aye - very good idea especially to provide high quality graphics for use in presentations for the BCU Sea Kayak Navigation Awards.
I could get rid of my black and white photocopies and use some colour graphics which are clear and easy to understand!
Cailean
Excellent idea - yeas please!
hi all
that would be a FANTASTIC addition to our instructional programs, we are constantly on the lookout for new and innovative ways of presenting things to try to reach all of our students.
michael @ ecomarine, Vancouver, BC, Canada
An excellent idea, would be most appreciated.
Used the WW images and found them very useful
in various aspects of coaching.
Hope you can share the Sea ones with us also,
extremely benevolent of you.
Excellent idea. I can see our club making extensive use of the material.
A sensational idea. I am looking forward to download the diagrams. New exercises would be appreciated, too.
In the middle run, if diagrams and illustrations are used for presentations and courses, I can see most of the students purchasing the book.
Could someone please check whether the book or I am right on the following points.
On page 85, lower diagram, the ground track would take you clear of the indicated overfalls therefore making the bearing correct.
On page 86, upper diagram, the water track is shown going to the overfall and not to the required island destination, thus giving an incorrect bearing to paddle on of 58 degrees. Taking this course from the starting point would definately take you to the overfall!
Hello Toni,
I hope this might help you. Both diagrams show the rights concepts but there are minor mistakes in them, that though a bit confusing, should not affect the general concept which is to be warned not to follow a Gps course without considering wind and tidal drift that as you know, you should compensate for by shaping a course:
1- The lower diagram in page 85 shows that the Gps bearing of 083º - which is wrong, use a protractor and it will read 072º - does not take into account that the kayak will drift to the South running into the overfalls or the islets.
In order to show this, the diagram allows for tide - that is, vectors where you will end up due to the tidal drift - , rendering a ground track of 88º that leaves the overfalls to starboard and takes you head on to an islet.
Hints:
- None of both bearings is right.
- The second bearing is the ground track. It has been drawn to show the effect of the tide on the first bearing, the water track.
2- The upper diagram in page 86, is right but the bearing of 058º should be written under the upper bearing, because the lower one - the water track - is 072º.
As you wrote, the water track is not going to the overfall. In fact, is not going anywhere as you will never follow it (it starts from the end of a tidal set and drift that you plotted, and your starting position is the fix from where set and drift were plotted). The water track is not really your track over the water but a vector that gives a course to steer against the tide.
The gist of it is that plotting tidal set and drift and vectoring from the end of your intended line of travel - ground track - allows for tide: It shows you where the tide drift will take you. But if you vector the same set and drift at the start of the ground track, you will shape a course, obtaining a course to steer to compensate for the drift. And this vector marked as water track does not render your line of travel, nor it will be affected by tidal drift, it is just a method to obtain a course to steer compensating for drift.
I suggest to follow the explanation with a protractor - or base plate compass - and dividers. It makes things clearer than I ever could.
Cheers,
Wenley
Thanks for clearing that up Wenley. It would appear that the designer changed my original drawings slightly to fit the page layout and I didn’t notice that as a consequence the bearings had changed a little. However, as you point out, the concept is essentially correct.
Franco
Hello Wenley,
Thankyou for your full and very prompt response to my query.
I misinterpreted the diagrams, thinking that in the diagram on page 65 the intended destination was the small island instead of the buoy. I now understand what the diagrams are intending to convey. Apologies if I created any confusion!
Franco,
I know i’ve been a bit slow here in understanding but do you think a fuller explanation of what the diagram on page 85 is representing would avoid confusion in later editions.
e.g the depicted ground track is the result of NOT allowing for tide.
Regards,
Tony
Hello Tony,
That is right. But to be more precise, the ground track (marked with two arrows) in the diagram at the bottom of page 85 is the result of not having shaped a course.
Allowing for tide lets you estimate where the tidal drift will take you. Shaping a course compensates for that drift. It does it by plotting and vectoring set and drift of the tide at your starting point.
Chapter 10 explains it nicely. It begs to be read with pencil, compass and protractor.
Cheers,
Wenley