Determining local magnetic declination by a magnetic compass
by tonytran2015 (Melbourne, Australia).
Click here for a full, up to date ORIGINAL ARTICLE and to help fighting the stealing of readers’ traffic.
#compass, #magnetic compass, #determine, #find North, #finding North, #magnetic declination, #Magnetic North, #sunrise, #sunset, #True North
A magnetic compass can be used to determine local magnetic declination. This declination varies with location and time.
Figure: True North, Magnetic North and Magnetic Deviation.
The declination is compiled from local laboratories data and made into world charts for navigation but each person can also determine his current local declination by himself.
Step 1: Requirements
Figure: Magnetic compass, dry, eddy-current-damped, ex-US Army.
We require:
1. A place where both Sunrise and Sunset can be observed,
2. Parallel magnetic field lines for the whole place, that is the direction of the magnetic needle does not change when the compass is moved around in such a place, and
3. A sighting compass as in the picture.
Step 2: Determining local magnetic declination.
Keep the sighting compass level and read the direction of Sunrise.
Keep the sighting compass level and read the direction of Sunset.
The bisector line of the two readings is the true North. The reading for the bisector is the mean value of Sunrise and Sunset values.
The reading of the bisector line is the absolute value of magnetic declination. Magnetic declination is positive when magnetic North is East of true North and negative when West.
RELATED SURVIVAL blogs
Finding North with a lensatic compass, posted on August 21, 2017
Beware of perilous flips by magnetic compasses, posted on June 14, 2016
Selecting and using magnetic compasses, posted on July 9, 2016
Navigating with an AM MW radio receiver, posted January 17, 2017, The Scorpius constellation, posted January 8, 2017, The Orion constellation., posted December 26, 2016, Rice as emergency food., Using GPS in off-grid situations, Slide Sky-Disks with grid masks showing azimuths and altitudes, Slide Sky-Map for displaying tropical stars.
BLOG IMAGE OF SURVIVAL CONTENTS
Hi! Someone in my Facebook group shared this site with us so I came to take a look. I’m definitely enjoying the information. I’m book-marking and will be tweeting this to my followers! Exceptional blog and terrific style and design.
LikeLiked by 1 person
I only wish that the Internet had much more information like this. I’ve never read anything like it.
LikeLike
Great post.|
LikeLike
Terrific post but I was wondering if you could write a litte more on this subject? I’d be very grateful if you could elaborate a little bit more. Many thanks!|
LikeLike
I was more than happy to find this page. I need to to thank you for ones time for this fantastic read!! I definitely loved every bit of it and I have you saved to fav to look at new information in your site.|
LikeLike
Great post. I was checking constantly this blog and I’m impressed! Extremely helpful information specially the last part 🙂 I care for such information a lot. I was seeking this particular info for a long time. Thank you and good luck.|
LikeLike
I am not sure where you are getting your info, but good topic. I needs to spend some time learning much more or understanding more. Thanks for excellent information I was looking for this info for my mission.|
LikeLike
Excellent post. I will be facing some of these issues as well..|
LikeLike
I couldn’t resist commenting. Very well written!|
LikeLike
Excellent, what a web site it is! This weblog presents valuable facts to us, keep it up.|
LikeLike
Terrific work! That is the kind of info that should be shared across the internet. Shame on the seek engines for no longer positioning this publish higher! Come on over and talk over with my website . Thank you =)|
LikeLike
Hey very nice blog!|
LikeLike
I’m not that much of a online reader to be honest but your sites really nice, keep it up! I’ll go ahead and bookmark your site to come back down the road. All the best|
LikeLike
I’m curious to find out what blog platform you happen to be utilizing? I’m having some minor security problems with my latest website and I would like to find something more safe. Do you have any suggestions?|
LikeLike
Informative article, just what I wanted to find.|
LikeLike
Have you ever considered publishing an ebook or guest authoring on other websites? I have a blog based on the same subjects you discuss and would really like to have you share some stories/information. I know my viewers would enjoy your work. If you’re even remotely interested, feel free to send me an e mail.|
LikeLike
I believe this is among the most vital info for me. And i am happy studying your article. However wanna commentary on few basic things, The web site style is perfect, the articles is really nice : D. Excellent activity, cheers|
LikeLike
Thank you a lot for sharing this with all folks you really recognize what you are talking approximately! Bookmarked. Kindly also seek advice from my site =). We could have a link alternate contract between us|
LikeLike
Hello exceptional website! Does running a blog such as this take a large amount of work? I have very little knowledge of coding but I was hoping to start my own blog soon. Anyway, should you have any ideas or techniques for new blog owners please share. I understand this is off topic nevertheless I simply needed to ask. Kudos!|
LikeLike
It does not take a lot of time and you don’t need to know coding. I started with the supplied help from WordPress.
LikeLike
Hey there I am so delighted I found your website, I really found you by mistake, while I was looking on Askjeeve for something else, Nonetheless I am here now and would just like to say kudos for a tremendous post and a all round interesting blog (I also love the theme/design), I don’t have time to read it all at the moment but I have book-marked it and also included your RSS feeds, so when I have time I will be back to read a great deal more, Please do keep up the fantastic job.|
LikeLike
This is a message to the Determining local magnetic declination by a magnetic compass – Additional survival tricks admin. Your website is missing out on at least 300 visitors per day. I have found a company which offers to dramatically increase your traffic to your website: http://shorturl.van.ee/h – They offer 500 free targeted visitors during their free trial period and I managed to get over 30,000 visitors per month using their services, you could also get lot more targeted visitors than you have now. Hope this helps 🙂
LikeLike
Thank you for re-blogging. This reply is far too late due to my difficulty in reaching wordpress.com from Vietnam.
LikeLike
Reblogged this on disturbeddeputy and commented:
Declination varies. This technique allows you to use your map with real accuracy.
LikeLike