JohnHuth Posted July 5, 2014 Share Posted July 5, 2014 I'm trying to write up some of the material I showed in the winter navigation workshops. Here's the first in a series. I could use some "beta testers" - i.e. guinea pigs…to see if the instructions are sensible. Here's a link:Drawing Magnetic Variation Lines Quote Link to comment Share on other sites More sharing options...
gyork Posted July 5, 2014 Share Posted July 5, 2014 Spot on John, and exactly how I prepare my charts. When no compass rose on my printed chart (e.g. NOAA booklet charts), I'll use my orienteering compass as a protractor, picking out a near-central N-S grid line as reference to mark my first magnetic line, then continue E and W with tick marks and additional magnetic lines. Quote Link to comment Share on other sites More sharing options...
kate Posted July 8, 2014 Share Posted July 8, 2014 That's very clever, marking it out in NM and using that parallel thingie. I have always just drawn parallel lines with a ruler, and figured close enough was good enough. I will keep your method in mind. Quote Link to comment Share on other sites More sharing options...
JulieC Posted July 9, 2014 Share Posted July 9, 2014 Very clear!!! Easy to understand! Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted July 10, 2014 Author Share Posted July 10, 2014 Thanks for the feedback! Here is installment 2 of the "on-the-go" navigation series. I'm trying to break it out into bite-sized pieces. Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted July 11, 2014 Author Share Posted July 11, 2014 Taking simple bearings. Link here. Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted July 15, 2014 Author Share Posted July 15, 2014 Bearings to objects. Thanks to Gary for his advice. Quote Link to comment Share on other sites More sharing options...
JulieC Posted July 16, 2014 Share Posted July 16, 2014 I am still following! These are very clear! Thank you! Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted July 22, 2014 Author Share Posted July 22, 2014 Next installment: Lines of position Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted July 26, 2014 Author Share Posted July 26, 2014 Next installment: range and back-bearing to find position Quote Link to comment Share on other sites More sharing options...
beckt Posted July 31, 2014 Share Posted July 31, 2014 …. is it just me? but I can't find the blog? Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted July 31, 2014 Author Share Posted July 31, 2014 If the hyperlinks don't work for you, you can directly access the blog at the following location:http://artofwayfinding.blogspot.comNote that some of the material is non-navigational in content (although most is) Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted August 1, 2014 Author Share Posted August 1, 2014 Dealing with magnetic variation Quote Link to comment Share on other sites More sharing options...
spuglisi Posted August 6, 2014 Share Posted August 6, 2014 John, Thanks for posting all this info. Quote Link to comment Share on other sites More sharing options...
flipe8 Posted August 13, 2014 Share Posted August 13, 2014 Good stuff. Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted October 3, 2014 Author Share Posted October 3, 2014 I've made another addition to my posts, this one is on dead reckoning. Here's the link. (suggestions always welcome) Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted October 5, 2014 Author Share Posted October 5, 2014 I'm testing out a purely graphical way of teaching vectors - this is first part in a series. It's not for everybody, but when we got to figuring how to find ferry angles at the REI navigation workshop, I realized that it was a bit much for some folks. Maybe some math-averse people might want to take a look and give me feedback. Link here Quote Link to comment Share on other sites More sharing options...
leong Posted October 6, 2014 Share Posted October 6, 2014 I'm testing out a purely graphical way of teaching vectors - this is first part in a series. It's not for everybody, but when we got to figuring how to find ferry angles at the REI navigation workshop, I realized that it was a bit much for some folks. Maybe some math-averse people might want to take a look and give me feedback. Link here>>Note that you won’t be able to get the ruler perfectly aligned with the northing axis, but using the tick marks and a bit of effort you can get decent results.If the compass base plate is large enough you can use it to drop a perpendicular from the tick mark to each axis. Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted October 6, 2014 Author Share Posted October 6, 2014 >>Note that you won’t be able to get the ruler perfectly aligned with the northing axis, but using the tick marks and a bit of effort you can get decent results.If the compass base plate is large enough you can use it to drop a perpendicular from the tick mark to each axis.Yup, that would work, too. The main point is that I wanted to give people the idea that there is some imprecision introduced when making these graphical solutions. Thanks for reading it! Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted October 7, 2014 Author Share Posted October 7, 2014 Next in series: adding vectorsAgain, the main point here is to give purely graphical solutions people can work with, using a backpacker's compass. To keep the clutter down in the figures, I used a protractor and ruler, but you should be able to see how to substitute a compass. Quote Link to comment Share on other sites More sharing options...
leong Posted October 8, 2014 Share Posted October 8, 2014 Next in series: adding vectorsAgain, the main point here is to give purely graphical solutions people can work with, using a backpacker's compass. To keep the clutter down in the figures, I used a protractor and ruler, but you should be able to see how to substitute a compass. Looks good, John. I wouldn’t put it past you if you could graphically demo Stokes’ theorem. Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted October 8, 2014 Author Share Posted October 8, 2014 (edited) For those of you who might be interested, I'm hosting a symposium on navigation on Nov. 14th (a Friday) at the Radcliffe Institute for Advanced Study (Harvard Sq.) - it's an all-day event, open to the public. Now, this probably will *not* help you with your kayak navigation skills, although who knows. We'll have talks on the neural basis for cognitive maps (Nobel prize this year in Medicine got it), the behavior of lost persons, animal navigation, culture and navigation, and the far out ideas like using pulsars as an interstellar GPS navigational system. Here's the link to the symposium Edited October 8, 2014 by JohnHuth Quote Link to comment Share on other sites More sharing options...
gyork Posted October 8, 2014 Share Posted October 8, 2014 Great vector refresher-it's been decades! Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted October 9, 2014 Author Share Posted October 9, 2014 Vector subtraction using a current problem as an exampleI know, you probably have to be pretty hard-core to do this, but here's a quote of one of the aims of the 5* navigation syllabus:To apply the above relevant information in calculating vectors and negotiating open crossings and/or coastlines with no landing zones and/or tide races and overfalls Ah-ha….so the 5* guys are supposed to know vectors…sez here….. Quote Link to comment Share on other sites More sharing options...
JohnHuth Posted October 11, 2014 Author Share Posted October 11, 2014 Last posting on vectors (aren't you glad?) This one shows a graphical way to figure the ferry angle. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.