I can’t find any resources that state how to adjust the HSI for magnetic declination. I assume it’s done with the fast erect equipment but any find anything on it either. Anyone know of a resource for this?
Hello pilots! Just bought the Viggen in the recent sale. Love it so far. But how do you dial the magnetic declination? Thanks to Chuck's fantastic guide I learned how to start it from cold & dark. But at some point you have to set the magnetic declination. But there is no pointer at that knob so how do I know when I have dialed in +6.5° for example?
Or can you just ignore this magnetic declination? Thx for your help!
Excuse my intrusion if this is not the correct sub to ask this question in, but I figured I could get an answer here.
Point A & B are not within sight of each other.
The (true) bearing from A to B is N 42* W as stated on a property deed, so the azimuth from A to B is 318* (yes/no?)
Magnetic Declination for this area is 8* West or -8*.
To walk from A to B, should I point my compass to 310* or
326* and follow that route?
I have a pretty good handle on converting the magnetic heading of my compass to the bearing on my map and vice versa (when going from a map bearing to a field bearing, add west declination and subtract east, and when going from field bearing to map, do the opposite...correct?). My current compass is not adjustable for declination
how do I orient a map while accounting for declination, then? If I simply line up the red arrow/orienteering lines with the grid, that will have me pointing the map to magnetic north. If i then rotated map and compass together so that my magnetic needle is pointing towards my area's declincation, would that then orient the map to true north?
As a second question...is it necessary to orient the map to tue north when measuring a bearing between two points on a map? or taking a bearing from a landmark and transferring it to the map? Why do we orient the map in the first place?
Gday,
Just want to double check I'm not making a mistake. If I want the compass on the watch to read the same bearing as an actual real world compass, I should set the Mag Var to 0 (zero) degrees correct?
I want to be able to get a bearing from the watch (or my phone which is set to mag) and then set a real compass as a backup (or visa/versa). I don't want to fool around with Mag Var until the paper map comes out.
Cheers
The point on Earth that a compass needle is attracted to (magnetic north) is not the same as the true north, the point where the rotational axis of the Earth emerges. In fact, the location of the magnetic north pole varies substantially over time, even over the course of just a few years.
Does that mean that those points being still (relatively) close together is just a coincidence that happens to be true today, and that in general, any point on Earth can become the magnetic north? And if that is the case, are all of them equally likely over time?
I am trying to figure out how to calculate the change in bearings over time due to magnetic declination and am hoping some of you might be able to explain the process
The textbook has this simple 4 line parcel. For line A-B, first you find the true bearing, then the bearing using today's declination.
It's confusing on whether to add or subtract the declination to get to true, and then whether to add or subtract the declination to get to today's bearing, and it changes depending on which quadrant you're solving. Is there a simple explanation for whether to add or subtract the declination?
Has anyone encountered this in the field, where a modern day bearing matches a really old bearing, when declination is accounted for? I guess this would not apply to PLSS states, where only true north is used?
I'm an American living in Europe. I've found it dificult to find the magnetic declination on any map provided in my local trecking stores in Germany. Their maps don't even have a compass on them, it's just assumed that the 'top' is true north...
I came across this archived post discussing topo maps, and I was wondering if anyone had similar resources that show magnetic declination for any given area? Thanks for your help!
I’ve been using Alerax’s LSO AI Script (which is awesome btw, check it out in the link below), anyway...
His script is in True North Heading, which is fine, I can either do the math or set the Hornet to True Heading.
My question is:
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Does anyone have a chart for the MAGDEC for each map?
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In the Hornet, when I set it for True North Heading and then set a heading for HSEL in AP, it steers me towards the Magnetic North Heading. Is this normal, or a bug? It seems to me that if I’m in True North Heading mode it should only steer on that bug, not the magnetic north setting.
Here’s a link to Alerax’s script if you want to try it for yourself, it’s pretty cool.
How does Gaia compute magnetic declination? How can I determine what declination it's using on the current map? Is the declination for a particular map computed in real time based on my current location (on earth)? Is the declination printed on the map when printed from GaiaPro?
Hi all,
I’m fairly new to the search, and I’m still in the phase of formulating a wide variety of opinions based on interpretations of the poem. One thing I’ve been thinking about lately is the magnetic declinations laid out on the map. Does anyone have any ideas as to its importance? Why show it on the map?
Which way do I point this thing? Every article I read makes me more confused, I'm in western MA and my declination is -14 or 14 west (I think). Do I set the bezel on my compass to 14 degrees or 346 degrees to compensate? Thank you in advance.
I haven't had to think about this in a long time. Assuming no wind, If I'm flying in an area that the declination is 9 degrees west, do I fly 351 or 009 degrees to get true north?
Is this permanent?
Pages with links
https://www.ngdc.noaa.gov/geomag/
https://www.ngdc.noaa.gov/geomag/magfield.shtml
Service pages
https://www.ngdc.noaa.gov/geomag-web/#declination
http://www.ngdc.noaa.gov/geomag-web/calculators/calculateDeclination
I guess this is a history question more than a science question, but I'm curious about the scientific methods used once the problem of declination was discovered.
I've read that the real north magnetic pole is about 1300 km from the geographic North Pole. Why is this?
