Great explanation of a topic that can get confusing.
@patricksmith89308 жыл бұрын
simple and straightforward. thanks for the video
@SHTFblogdotcom8 жыл бұрын
Thanks!
@paganphil1005 жыл бұрын
An easy way to remember what to do with the magnetic variation / declination is: From grid (map) to mag (compass) ADD. From mag to grid GET RID.
@DANT-E5 жыл бұрын
That's wrong, you add if it is westerly or left and subtract if it's easterly or right
@NewfieLawNerd3 жыл бұрын
That’s true only if people remember that Westerly is a negative number
@caseykelso13 жыл бұрын
You're the first video about explaining declination and setting the compass that I've seen that actually make sense and works with my brain. Thanks bro and for your service. And works in reverse if you're on other side of 0° subtract?
@ronhansen68284 жыл бұрын
For a great map and compass app, goto Google Play Store apps and search for TrailBlazer Ranger Ron. This app gives up range and bearing from one GPS coordinate to another which you can use to practice your Land Nav skills with.
@stevek88294 жыл бұрын
Your app sucks. Who wants to be blocked from UTM?
@saintpo3 жыл бұрын
Extremely unpopular. PASS
@ronhansen68283 жыл бұрын
@@saintpo who asked ya for your opinion
@taikenmaster7 жыл бұрын
Great job thank you for this!
@SHTFblogdotcom7 жыл бұрын
Hope you found it useful.
@MarcosGonzalez-fm8jm8 жыл бұрын
Left, Add, Right, Subtrac.t LARS rule
@michaelspurlock95756 жыл бұрын
What do you mean? Give me an example or two of Easterly Declination? I would greatly appreciate it.
@DANT-E5 жыл бұрын
If your declination is Westerly or Left like in the video, you add that number to your grid azimuth to get your magnetic azimuth. If your declination is easterly or right, you subtract that number from your grid azimuth to get your magnetic azimuth.
@byrondelavega64919 жыл бұрын
great job, thanks a lot
@jamesnaccarato-garufi57705 жыл бұрын
According to the legend, the difference from Magnetic to True North is 18 degrees, and the difference from Grid to True North is 0.8 degrees. So shouldn’t you add 17.2 degrees to go from a Grid Azimuth to a Magnetic Azimuth?
@albusai5 жыл бұрын
James A Naccarato-Garufi no , because he is not using the true north to navigate , only grid and magnetic
@CharlesGray216 жыл бұрын
left add right subtract only works when converting magnetic to grid, no?
@alanloveless42163 жыл бұрын
Easterly declination is positive (+) Westerly declination is negative (-) Magnetic to grid (compass to map) always add. Grid to magnetic (map to compass) always subtract. Examples: 1. Declination is 10 degrees East (positive). Compass reads a 45 degree azimuth. Map azimuth = 45 + 10 = 55 degrees. Map azimuth measured as 55 degrees. Compass azimuth = 55 - 10 = 45 degrees. 2. Declination is 10 degrees West (negative). Compass reads a 45 degree azimuth. Map azimuth = 45 + (-10) = 45 - 10 = 35 degrees. Map azimuth measured as 35 degrees. Compass azimuth = 35 - (-10) = 35 + 10 = 45 degrees.
@michaelspurlock95756 жыл бұрын
How about Easterly Declination? How do you do that?
@TyJee286 жыл бұрын
If magnetic declination is 18˚ east. You would subtract 18˚ from the azimuth measured on the map. Instead of adding 18˚, for when mag declination is west. Staying with his example of 33˚ grid azimuth from the map. If mag declination is 18˚ east, on the compass you would set the azimuth to 33˚ - 18˚ = 15˚ compass magnetic azimuth. I use an acronym I created to remember the correct adjustment. Maybe it will work for you too. (for me it works better than LARS, left add right subtract) WAvES = West Add v East Subtract. For westerly declination, add the number of degrees of mag declination. For easterly declination, subtract the number of degrees of mag declination. Actually, I made up a phrase to help remember which way to adjust the azimuth when going from map (grid azimuth) to compass (magnetic azimuth) Or going from compass (mag. azimuth) to map (grid azimuth) Which is : The Map WAvES to the Compass & the Compass WAvES Back to the Map. (the two need a friendly relationship, yes) What that means is When going from Map to Compass use WAvES, West Add v East Subtract. (The Map WAvES to the Compass) If going from Compass to Map, use WAvES Back(wards) Add becomes Subtract & Subtract becomes Add. (The Compass WAvES Back to the Map) If you measure an azimuth with the compass, and you want to find the correct azimuth to measure with the protractor on the map. You use "the Compass WAvES Back", part of the phrase. Back meaning - the math function is reversed. So East Subtract becomes instead, East Add. For example; if mag declination = 10˚ East. And with the compass you measured an magnetic azimuth of 80˚. On the map, using the protractor, you would draw a line for a grid azimuth of 90˚. [ 80˚+10˚ = 90˚ ] {I think you can see if mag declination is west, you would also reverse the math function, and West Add would become West Subtract, when going from compass to map} Hope that was understandable, and it helped. That acronym and phrase works for me, but maybe that's only because I made it up myself.
@joshuabradshaw16475 жыл бұрын
@@TyJee28 This was helpful thanks for the tip
@DANT-E5 жыл бұрын
You forgot to mention LARS. Still very good video.
@MrDogmeat15 жыл бұрын
Is west declination subtracted from the azimuth and east declination added to the azimuth to go from grid to magnetic
@MrDogmeat15 жыл бұрын
my bad, its the other way.. sorry west is best add, east is least / subtract
@dwaynerobertson3834 жыл бұрын
You were kind of right the first time. If you are going from compass to map you would add East and subtract West. This example shows only from map to compass. Grid North to Magnetic North (in other words from map to real world), you add West and subtract East. If you are going from Magnetic North to Grid North (in other words from real world to map), you would do the calculation as you first stated; add East and subtract West. Map to compass - Add West and Subtract East. Compass to map - Add East and Subtract West.
@SHTFblogdotcom9 жыл бұрын
Thanks, Byron!
@babyhands27703 жыл бұрын
My dumb army brain understands this better than other videos
@majormasingil99616 жыл бұрын
The declination scale at the bottom of your topo indicates 18 deg between MN and TN. You need to subtract 2 deg in order to obtain the difference between MN and GN. So total declination between MN and GN is 16 deg
@SHTFblogdotcom6 жыл бұрын
It's an old map. The actual declination is 16 degrees for where I live. Good catch though!
@TyJee286 жыл бұрын
You guys lost me. It looks to me like the difference between TN and MN north is 18˚ on your map diagram. With MN being 18˚ west. The difference between TN and GN is only 8 minutes, or 2 mils. Essentially TN and GN are the same, and you would use 18˚ west GMA,. I understand if the difference between TN and GN was 2˚, and GN was 2˚ west of TN, then yes, you would use GMA of 16˚ west. But it's only 2 mils. If you mentioned looking up updated mag declination to be now only 16˚, I must have missed hearing it. The Cammenga compass is a great robust compass, but it can not resolve 2 mils difference in azimuth.
@majormasingil99616 жыл бұрын
TyJee28 hey man you're right. I remembered the 2 as being in the degree scale, but it's MILS. For that map I would use 18 deg. Thanks!