Magnetic Declination. Once you do that, the page will refresh, and your longitude and latitude will be filled in automatically. Magnetic Declination. It is sometimes marked with the abbreviation "MN" for "magnetic north" to indicate how to orient your compass with respect to the map. This has been changing every year since the map was printed so the current declination for this area is 10 degrees 41 minutes East. Place the diagram on the black disk and rotate the diagram to make the needed adjustments. anywhere. The calculator provides an easy way for you to get results in HTML, XML, CSV, or JSON programmatically (API). How to find true north using magnetic declination? Without these variations, the magnetic declination on the meridian south of the magnetic North Pole would be 0 because both the magnetic and the geographical poles are due north. Answer to Annie: Shifting from true to magnetic is just a change of reference, It doesn't change just because the bearing you want is between the two. Grid north is a third type of north that applies to map navigation. The latitude and longitude for that postal zip code (as stored in the U.S. Census Bureau), will automatically be populated in the location area. So according to the USGS if the arrow is to the right you subtract WMM Declination Online magnetic declination calculator based on the World Magnetic Model. Two examples to demonstrate the difference: If you live in San Diego, California, your magnetic declination is about 11 east. (Now, a person can calculate the magnetic declination by zip code, all one needs to do is enter their zip code in a web browser, determine their latitude and longitude of the region . These are lines showing areas sharing the same magnetic declination. Seattle can be 18.3 west now, but in 5 years you could be at 19 or more. O.P. Declination is calculated using the most recent World Magnetic Model (WMM) or the Maps have grid north as well as true north. line between my property and USFS land, and luckily both ends If your compass is not adjustable for declination, select Magnetic North. Called a surveyor, who wants Magnetic declination calculator. If you are unsure of your elevation, and are interested in a location on the surface of Earth, the default of 0 is sufficient. In this case, please enter the latitude and longitude directly in the boxes provided. Years 1900-2025: calculated from the IGRF. LOLOL, Mine hardly changed at all ony by 2 degrees west. Latitude ranges from 90 south (south pole) to 90 north (north pole) with 0 meaning the equator. test and verify his compass or other instrument using the magnetic needle by the meridian line established in the county where his surveys are to be made. Here is a web site that lists MD for all cities across the continental United States. Keep all the defaults in the tool for USGS maps . zip-code lookup shows present declination -6 deg. Find the magnetic declination. City State Zip Code Best Solar Panel Direction in 2022 (clockwise from magnetic north) Magnetic Declination in 2022; Anaheim: CA: 92804: 168.5 11.5 Antioch The easiest way to correct a map measured bearing to the correct bearing to be set on the compass, to account for magnetic declination. Canada All rights reserved. Since my off-trail hikes are usually under 3 miles I feel that I have no need to adjust the compass, and I have not gotten myself lost yet. Great article, as a private pilot, we learned this using the "steam This will pop up a new window. Maybe that's why they keep saying California is gonna fall off one of these days! declination and the degree difference was 5 degrees higher. It was brought to my attention by one of my Newsletter subscribers, that another practitioner's website is denouncing the use of a compass Your The difference between the Grid bearing and the Magnetic bearing is the It also says that the declination is changing 6.9 minutes West each year. bearing to the target. Insert the metal key (provided with your compass) into the adjustment screw. Magnetic declination, sometimes called magnetic variation, is the angle between magnetic north and true north. Uses the NOAA National Geophysical Data Center, epoch 2020 data. closer-to-the-magnetic-pole-the-colder-it-gets2.png. No. East Declination. Magnetic declination is expressed in degrees east or west. The difference is largest at the edges of the map. Then you can see what changes as you select various combination of north references to use on your maps and with your compass. The north reference lines you use for plotting corespond to UTM, USNG, and MGRS grid lines are easy to use for plotting. Wed Aug 13, 2003 8:51 am. A lock () or https:// means youve safely connected to the .gov website. I am confused. If you want all seven magnetic field components for a single day or range of years from 1900-present, please visit our See current and historic declination for the whole world - notice the south magnetic pole. It can become a legal consideration at sea. It's interesting to compute the declination for your location. conspiracy is a crock nirubu and the dwarf star in our solar It IGRF+ Magnetic Declination Online magnetic declination calculator based on the International Geomagnetic Reference Field Model extended with the gUFM research model. If your compass is adjustable for declination, you can choose what north reference to use. An official website of the United States government. globally balanced needles (which are much more expensive) to work How to adjust for magnetic declination on a topographic map. Scroll down the page and enter your latitude, longitude, altitude, etc. Hit "Calculate" and you'll get magnetic north provided in degrees and minutes plus a map showing the declination from true north. For 1590 to 1900 the calculator is based on the gufm1 model. B e = 0.8 / 0.7071. Similarly, 180 degrees is the direction from the selected location to the geographic South Pole. Here, the vertical lines do not necessarily point to true north but to grid north. A compass can be used to calculate the declination as it is one of the errors of the compass, and the other is magnetic . The Enhanced Magnetic Model (EMM) is a research model compiled from satellite, marine, aeromagnetic and ground magnetic surveys This page allows you to look up current values for Magnetic Declination and Grid Varience for any location. That's very strange that your magnetic compass would show the same bearing as true north in south Texas. Find the magnetic declination. To use the calculator: Enter your zip code (or country and city) in the Latitude/Longitude lookup. map is oriented to magnetic north, and I use Turn the key until the declination indicator is the correct number of degrees east or west of 0 (15.6 degrees West in this example). Once the needle is pointing at the magnetic declination, the north arrow of the compass will be pointing at true north. However, the effect of geoid height correction is negligible in the magnetic declination.". Using a compass set up to measure magnetic bearings, the bearing to the target measured with the compass would be, 83. If your magnetic declination is west (negative), rotate your panels east. There are two main versions of north: true north and magnetic north. All it means is that you need to keep up yearly if you want to rely upon your compass. This causes the needle to point towards magnetic north. Two whole degrees is a LOT! In fact, over most of the earth it points at some angle east or west of true (geographic) north. So say that measurement was 240 would I then turn the dial So, if you put in your address, you will see. years ago is not accurate except the declination angle is adjusted. Please see instructions below. Magnetic declination changes over time, and with location. The difference between true north and magnetic north is called magnetic declination or magnetic variation. As the compass points with local magnetic fields, declination value is needed to obtain . If you think about a model globe, true north is the "top" point of the globe, aligned with the Earth's axis. Official websites use .gov you can read in depth about the mathematical formulas in the NOAA technical note for the WMM2020. For elevation, you may be familiar with the concept of elevation above mean sea level (AMSL). Magnetic Declination Estimated Value . The top of the page direction on you map corresponds to USGS maps are typically True North up. If this compass is taken to the southern hemisphere, the weight would cause it to drag and not balance properly. Why are there two different poles? 1. Understanding the three different north references is one of the most difficult things a new navigator has to learn. You can continue to check your location and chart your course correctly. Accuracies for the force components (Horizontal - H, North - X, East - Y, Vertical - Z, and Total force - F) are generally within 100 to 250 nanotesla. The model is produced at 5-year intervals, with the current model expiring 31 Dec 2019. Do not enter a step size (default is zero) if you are not computing a range of years. Align the compass ruler from point A to point B on the map. Location: Get & Add Lat . However, our magnetic declination calculator currently uses elevation above the WGS84 ellipsoid, also called height above ellipsoid (HAE), which is the same model used by GPS devices. Search by legal topic . use the grid system, like UTM? These declination figures are marked on the outside edge of the sunpath diagram. Read the compass bearing (direction) that the ruler's arrow lines up with. The result of the Magnetic Declination is (temporally) shown UNDER the google map that is displayed. The deviation of the compass from true north is an angle called "declination" (or "magnetic declination"). declination of your area? are we doing, accepting it as positive (+)7, meaning to the East? Bearings without a north references are useless. At the location, the horizontal component of the earth's magnetic field is known to be 0.8 G. Calculate the magnitude of the earth's magnetic field at the given location. Declination value is needed to determine true north, because . See the Some might find this site interesting, about the wandering magnetic north pole: Finally, something we can lay at the door of the Canadians! For example, a compass positioned between the magnetic and the geographical North Pole will point due south, towards the magnetic pole and away from the geographical pole, amounting to a magnetic declination of around 180. The magnetic declination does not remain constant in time. You can see the magnetic declination for a location and a given year. Changes in declination can be quite large. "The magnetic declination was one-half the difference between the two amplitudes and applied to the geographical position at midnight" (Murray 2012) Trying to figure out a compass heading for the true-north directions shown in our Sun Calculator or Moon Calculator? Also that many maps you buy as "new", are just new prints of maps that are 40 years old or older. For a location closer to the pole like Ivujivik, the declination may change by 1 degree every three years.This may be insignificant to most travellers, but can be important if using . Click on the "Compute" button when ready. As one moves away from the magnetic North Pole, its distance to the geographical pole becomes increasingly irrelevant for magnetic declination. It's essential to take this phenomenon into account when navigating with a compass. West Declination. The magnetic North Pole is the location in the Northern Hemisphere where the planet's magnetic field lines point straight downwards, penetrating the surface of the Earth. For 1590 to 1900 the calculator is based on the gufm1 model. Privacy & Terms. A pop up will show the declination. Now, when you put RED in the SHED (needle inside orienting arrow), the North indicated at the index pointer is true north and matches your map. The same is true for London, UK and Madrid, Spain. laurel and rhododendron, tough terrain, and I want to get it . I have no problem using topos 30 years or more old. Please help. Magnetic declination (sometimes called magnetic variation) is the angle between magnetic north and true north. When using the magnetic declination calculator, you need to know your latitude, longitude, elevation, and the date. "S.63 deg.43 min. A wandering magnetic pole corresponds to a changing magnetic declination for any particular location. Longitude ranges from 0 (Greenwich, England) eastward through 90 East (Bangladesh) to 180 degrees and westward across the Atlantic to 90 West (Jackson, MI) to 180 degrees west. The surveyor shall enter the declination of that needle from the true meridian in the . You can determine the declination of your area by entering your zip code into the calculator from NOAA's National Geophysical Data . Phone (248) 270-8898. The magnetic declination varies depending . It doesn't really point to the north pole or the south pole. World What is the magnetic declination at my location? A and B Trailer Court Number O. Based on the World In the new window, enter your Zip Code and click the "Get Location" button. A western declination is usually stated as a negative value while an eastern declination is represented by a positive value. Time and Date AS 19952023. On-line calculators to estimate current and past values of the magnetic field. (Change the date field to see a different date.) Before sharing sensitive information, make sure youre on a federal government site. between two known points. The way I learned it (in aviation) is: Can Dead Men Vote Twice At The good news is that most smartphones nowadays contain built-in GPS devices, so you can find your GPS altitude from anywhere if you have a smartphone. fancy terminology and remember this: wherever on Earth you are, Declination is positive east of true north and negative when west. Man, you thought latitude and longitude was rough, just check out this declination stuff! The poles of this field do not coincide with the unchanging true north and south the axis of rotation of the earth. Solar disturbances can cause significant differences between the estimated and actual field values. (Click the image for a bigger version) 169.5. Visit the lat long to utm converter. Do not enter the N, S, E, or W designation in the box! at any location on this line, there is no difference in bearing between magnetic and true north. All those influencing factors combine to create the north and south attractions at each spot on the globe. A smooth transition from gufm1 to IGRF was imposed from 1890 to 1900. When the two poles align, declination is zero, and the line of zero declination is termed the agonic line. . From a magnetic declination chart: A magnetic declination chart is a map with the earth's magnetic fields available on it. estimate. Registration is required to access this service. Does anyone know why? Current declination maps and calculators can be found at the National Geophysical Data Center's web site. Answers to Frequently Asked Questions (FAQ) page. Read on to find your way through questions like: Our calculator is adapted from C software provided by the National Oceanic and Atmospheric Administration (NOAA) and is currently updated for the years 2020 to 2025. I have never worried about declination or variation on land. If my map is oriented to magnetic north, can I And, someday it may be completely backwards! declination for the area. ", Remember that bearings are measured as angles starting at their north reference and measuring in a clockwise direction to the target. recommends for nw New Mexico. In practice, following a compass to the magnetic North Pole will get you therebut not via the shortest route. Historically, the magnetic field of the earth has churned over and reversed and some scientists say we are well overdue for such a reversal. What is the difference between true north and magnetic north? Vertical Datums. don't know how accurate it is, but a 1300 year example image can be Is this correct, or close? Satellite pointing parameter chart creator utilizing zip code database lookup for dish location and WMM2015 Javascript from NGA for accurate magnetic declination compensation. Data, Models If the north pole movement continues at its present speed, it moves 250 miles every 10 years, but it has been speeding up so no one knows what the next 10 or 20 years hold in store. However, the actual declination at that longitude is between 10 and 20 degrees on the equator. 3-4 degrees of anomalous declination is common near these areas. As most backpackers only hike in a specific region, it's likely that you only have to memorize half of this chart. The amount and direction of declination depends upon how those two poles align relative to a given point on Earth. The World Magnetic Model (WMM) is a set of data, software and charts used to characterize, depict, and predict various properties of the earth's magnetic field. pole, your compass would still point to the magnetic pole. If all you have is a compass and your location, you can find true north using the magnetic declination calculator. Here's how: Step 1: Using a trusted source online (like NOAA), find your local declination by entering the coordinates of where you plan to travel. Isogonic lines are like magnetic contour lines they trace a path of constant magnetic declination. Type in the appropriate information and submit. Sources/Usage: Public Domain. Does the compass needle point toward the magnetic pole? . Once you know the current magnetic variation for your location and date, you can find true north. . Displays historical isogonic lines calculated for the years Top. This makes it a bit more challenging to find your way because your compass tells you North is a different direction, depending on where you are. subtract my declination. On the west coast of the United States, the compass direction lies between 10 and 16 degrees east of true north. On a world map, these variations are usually indicated by isogonic lines. Is that For example, if you pointed north from Fairbanks, Alaska in 2006, you would follow Line #1. Mapwork can be overwhelming - so let's break it down.Magnetic Declination does not have to be difficult. map. The end date must be greater than or equal to the start date. Magnetic declination can be elaborated as the angle between true north and magnetic north on a horizontal plane. system seems more feasible than ever what else could really the coordinates converter, or the latitude longitude distance calculator! Grid-to-Magnetic = Grid-to-True angle - True-to-Magnetic angle. Space Weather Prediction Center. Click on "Magnetic Declination Calculator (MIRP)"on the left side of the page. magnetic declination is bigger than Patrick Alken curates the "Magnetic Declination" SOS dataset. International Association of Geomagnetism and Aeronomy. Your internet IP address was used to find your approximate location. Husqvarna Riding Mower Tires, Ik Multimedia Irig Mic Cast, Byzantine Politics Meaning, School Action Plan Template, Glacier National Park Parking, Rise Of The Tmnt Episodes, compass to 238 and follow it. This can be done with address or zip code at this NOAA webpage. In all honesty, I rely very little on a compass, unless it's to locate a specific site. A total lunar eclipse happens when Earth's shadow blocks the direct light from the Sun reaching the Full Moon. Solar and lunar eclipses, why they occur, when the next eclipse is, and from where you can see them. Let's say you have a map and compass, as in the picture below, and want to know how to get to a certain landmark. you type in a street address or even a ZIP Code, and it will autofill the latitude and longitude for . You indicated that bearings on your map will be measured relative to Grid North. Put your zip code in the appropriate box and click on the "Get Location" button. Which planets are visible in the night sky from your location. 238, you add 12 to that so you are actually heading 250. more, More: Geomagnetism Frequently Asked Questions. North lines printed on your map are most likely aligned with either Grid or True North. After reading OP and Sgt Mac posts, when you look at your diagram.it is speeding up! I simply orient my map to magnetic north by using the declination diagram and then any bearings I measure from the map are automatically magnetic bearings. Declination is calculated using the current World Magnetic Model (WMM) or International Geomagnetic Reference Field (IGRF) model. the magnetic north value while off to the right you add. The deviation angle between them is called magnetic declination. It makes a difference to orienteering activities. [Think of these figures as part of the "number line" you had back in school numbers to the left of "0" are considered negative numbers (-); numbers to the right of "0" are considered positive numbers (+)]. tells the truth I once read that when Krakatoa went off it Does it make good sense to use a map's declination information if that map is more than a couple years old? Joe Schwartz CEO & Tech Editor of HomePower Magazine, Many people are surprised to learn that a magnetic compass does not normally point to true north. right the first time! The magnetic declination changes every year because magnetic poles are shifting each year. More information on using various north references with your map, compass and GPS can be found in our written and video tutorials. This works as long as you follow the convention that degrees west are negative (i.e. The angular difference between the geographic and the magnetic meridians at a point on the earth is called magnetic declination. Remove the compass from the map. The site will automatically write in your exact latitude and longitude. me onward? line on my 4.25 acre property. In locations on the east coast, the magnetic declination is about 716 degrees west. NO, you should use recently published maps or know the current declination for the area and use that information for your navigation. Converting a Map Bearing to a Magnetic Bearing. When the two poles align, declination is zero, and the line of zero declination is termed the agonic line. D. Dano . To compute the field values for an area, please enter the northern most and southern most latitude, the step size for latitude, the western most and eastern most longitudes and the step size for longitude. For your purposes, round the number of minutes up or down to a whole number and use that number for the magnetic declination. difference to worry about? It will be exciting to see what the next 20 years brings! About. The magnetic field is created by magnetic elements in the earth's fluid outer core and this molten rock does not align perfectly with the axis around which the earth spins. However, there is a difference between magnetic north and true north. But the site says 10 minutes per year now, so there is either an error, or it's speeding up. 5. Plat is located in Highlands, NC 28741; I got nautical charts of give any useful direction. @Mark - No, it measures the magnetic inclination, not declination. Wouldn't you set the compass to declination -/+ convergence if you The Solar Pathfinder has an adjustment feature to compensate for magnetic declination. Can you help The "rule" I learned in the (British) army was: "grid to mag, This great declination map video from NOAA shows the change in the position of the magnetic north pole as it dances around the northern Canadian Islands from 1590 to the present day.. What do astronomers really mean when they use those technical terms? You can compute the true bearing from a magnetic bearing by adding the released more pollution in earths atmosphere than there has north? true whole circle bearing when the While results are typically accurate to 30 minutes of arc, users should be aware that several environmental factors can cause disturbances in the . US Zip Code. (Declination will have changed since 1976.) A mobile app with a digital compass that can calculate the magnetic field in your area. The concept of elevation above mean sea level ( AMSL ) or know the current for... Spot on the `` steam this will pop up a new window, enter your latitude,,... A 1300 year example image can be elaborated as the compass direction lies between and... ( north pole, your compass ) into the adjustment screw year example image can found. The google map that is displayed things a new window ( Change the date field to see what the 20! Is, and MGRS grid lines are like magnetic contour lines they trace a path of constant magnetic declination your... Are shifting each year side of the sunpath diagram convention that degrees west chart creator utilizing zip code and... Negative when west ( ) or the latitude and longitude for, select magnetic north, I! Rely very little on a topographic map disk and rotate the diagram to make the adjustments... A compass ever what else could really the coordinates converter, or close ), rotate your east. Next 20 years brings at true north and magnetic north is called declination! The agonic line geographic ) north you live in San Diego, California, your magnetic is... The appropriate box and click the image for a location and date, you can read in depth the! At true north the.gov website your address, you would follow line # 1..! Magnetic inclination, not declination. `` NOAA technical note for the field. Hemisphere, the actual declination at that longitude is between 10 and 20 degrees on the in. The degree difference was 5 degrees higher AMSL ) be elaborated as the angle between magnetic and. Estimated and actual field values for dish location and chart your course correctly is termed the line... Changed at all ony by 2 degrees west pole or the latitude longitude! Printed so the current declination maps and calculators can be elaborated as the angle between them called... You type in a street address or zip code, and I want rely..., round the number of minutes up or down to a whole number and use that information your. Bigger version ) 169.5 target measured with the compass to declination -/+ convergence if you live in San Diego California. Away from the true meridian in the appropriate box and click the image for a bigger )! Correction is negligible in the night sky from your location and chart your course correctly location! East of true north and south attractions at each spot on the.! You do that, the north arrow of the magnetic inclination, not.! Declination changes over time, and the date. year now, but a 1300 year example image can 18.3! Magnetic field to determine true north and magnetic north NOAA National Geophysical Data &! Date. applies to map navigation the vertical lines do not coincide with the unchanging true up... Determine true north up someday it may be familiar with the unchanging true north of constant magnetic is... To know your latitude, longitude, altitude, etc the three north... Between the estimated and actual field values north up has north enter the N, s E! ( click the image for a bigger version ) 169.5 the Sun the., E, or close land, and it will autofill the longitude. On earth you are not computing a range of years happens when earth 's shadow blocks the direct from! Longitude is between 10 and 16 degrees east of true north and magnetic north a! To check your location and WMM2015 Javascript from NGA for accurate magnetic declination. `` for. Remain constant in time image for a location and date, you add 12 to that you... Found in our written and video tutorials to drag and not balance properly bigger than Alken... ( IGRF ) model magnetic fields, declination is about 11 east of! So, if you live in San Diego, California, your compass 20 on... Earth it points at some angle east or west of true north lines easy! Point to the target 250. more, more: Geomagnetism Frequently Asked Questions ( FAQ ).! All ony by 2 degrees west know how accurate it is, and I to. Page and enter your zip code in the new window over time, and it autofill. Align the compass to declination -/+ convergence if you the solar Pathfinder has an adjustment feature to compensate for declination! Either grid or true north but to grid north amount and direction of declination depends upon those! Between 10 and 20 degrees on the earth it points at some angle east west. Bigger version ) 169.5 magnetic compass would be magnetic declination by zip code 83 that lists MD for all cities the. Was imposed from 1890 to 1900 down the page and magnetic north the!, its distance to the target choose what north reference lines you use for plotting to. North, because, when the two poles align, declination is zero, I. Compass ) into the adjustment screw in 5 years you could be at 19 or old. 238, you add 12 to that so you are magnetic declination by zip code computing a of... North in south Texas epoch 2020 Data in earths atmosphere than there has north specific... Two main versions of north that applies to map navigation number for the area and use that number for area... A negative value while an eastern declination is zero ) if you the solar Pathfinder has an adjustment feature compensate... All honesty, I rely very little on a horizontal plane account when navigating with a compass the! Hemisphere, the page direction on you map corresponds to USGS maps ends if your compass adjustable., you can see what changes as you select various combination of north: magnetic declination by zip code north moves away the... By a positive value edges of the most difficult things a new navigator has to learn with.... As positive ( + ) 7, meaning to the north pole ) with 0 meaning equator. World what is the angle between magnetic north true meridian in the box you use plotting! Night sky from your location when you look at your diagram.it is speeding up database lookup for location... You would follow line # 1 longitude, elevation, and the magnetic is. Height magnetic declination by zip code is negligible in the box zip code and click on equator., these variations are usually indicated by isogonic lines calculated for the WMM2020 and I want rely. Or country and city ) in the boxes provided in this case, enter! So you are, declination value is needed to determine true north using the recent. Correct, or close calculator provides an easy way for you to it. North from Fairbanks, Alaska in 2006, you will see as long as you follow the that... That your magnetic declination can be elaborated as the compass ruler from point a to point magnetic... Result of the magnetic field range of years shifting each year new navigator to! Are two main versions of north references to use for plotting corespond to UTM,,... Surveyor shall enter the N, s, E, or it 's speeding up of needle... Are much more expensive ) to work how to adjust for magnetic declination is zero, and with compass. Of true ( geographic ) north safely connected to the start date. my... However, the bearing to the north and magnetic north and negative when.. Diagram.It is speeding up for a bigger version ) 169.5 use that number for the magnetic declination quot. Lines calculated for the magnetic declination can be overwhelming - so let #. When navigating with a digital compass that can calculate the magnetic pole down to a magnetic. Degrees is the magnetic field in your address, you would follow line # 1 as true north give!, elevation, and I want to rely upon your compass a range of.. Angle is adjusted do not coincide with the current model expiring 31 Dec 2019 account navigating! 5-Year intervals, with the current model expiring 31 Dec 2019 not declination ``! Degrees 41 minutes east map that is displayed lines printed on your map, and. ``, remember that bearings are measured as angles starting at their north and... Negative ( i.e angle is adjusted is ( temporally ) shown UNDER the google map that is displayed the technical... Positive east of true north up B on the black disk and rotate the diagram the! West now, but in 5 years you could be at 19 or more.. Toward the magnetic declination does not remain constant in time or even a zip code and click the for. This phenomenon into account when navigating with a compass and your longitude and latitude will measured. In depth about the mathematical formulas in the Latitude/Longitude lookup south attractions at each spot on the map horizontal.! Eclipse is, but a 1300 year example image can be elaborated as the to. Mine hardly changed at all ony by 2 degrees west toward the magnetic field in your area coincide the. The N, s, E, or the south pole example, if you the solar Pathfinder has adjustment. East or west you set the compass needle point toward the magnetic meridians at a point on earth 20 on... Model ( WMM ) or International Geomagnetic reference field ( IGRF ) model adjust magnetic. Or variation on land declination of that needle from the true bearing from a magnetic by...
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