{"id":14251,"date":"2025-06-03T16:23:21","date_gmt":"2025-06-03T10:53:21","guid":{"rendered":"https:\/\/ibexaviation.com\/pilot-training\/?p=14251"},"modified":"2026-07-26T10:19:52","modified_gmt":"2026-07-26T04:49:52","slug":"grid-navigation-technique","status":"publish","type":"post","link":"https:\/\/ibexaviation.com\/pilot-training\/grid-navigation-technique\/","title":{"rendered":"Grid Navigation Technique"},"content":{"rendered":"<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-1.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<h2>Grid Navigation<\/h2>\n<p>Grid Navigation is a method of navigation using a grid system of lines on a map or chart. It helps pilots identify positions, directions, and routes accurately. Grid references are used for efficient flight planning and navigation over large areas.<\/p>\n<h3>Introduction to Grid Navigation<\/h3>\n<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-2.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<ul>\n<li>True and magnetic directions become unreliable at high latitudes for three main reasons:\n<ul>\n<li>Rapid meridian convergence causes true tracks to change quickly.<\/li>\n<li>Magnetic variation is large and changes considerably with position.<\/li>\n<li>The magnetic compass becomes unreliable because of the weak horizontal component of the Earth&#8217;s magnetic field.<\/li>\n<\/ul>\n<\/li>\n<li>Grid navigation overcomes these problems in polar and high-latitude regions.<\/li>\n<li>It significantly reduces steering difficulties during navigation.<\/li>\n<\/ul>\n<h3>Grid Charts<\/h3>\n<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-3.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<ul>\n<li>Grid charts use a square grid instead of latitude and longitude graticules.<\/li>\n<li>They are primarily used for navigation in high-latitude and polar regions.<\/li>\n<li>A grid chart is constructed by selecting a <strong>datum meridian<\/strong>.<\/li>\n<li>The <strong>Greenwich Meridian<\/strong> is commonly chosen as the datum meridian.<\/li>\n<li>All other grid meridians are drawn parallel to the datum meridian.<\/li>\n<\/ul>\n<h3>Grid Convergence<\/h3>\n<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-4.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<ul>\n<li>On a grid chart, convergence may be expressed as:\n<ul>\n<li>The angular difference between <strong>True North<\/strong> and <strong>Grid North<\/strong>.<\/li>\n<li>The angular difference between the local meridian and the datum meridian.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Grid Convergence in the Northern and Southern Hemispheres<\/h3>\n<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-5.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<ul>\n<li><strong>Southern Hemisphere:<\/strong>\n<ul>\n<li>Grid convergence has the same sense as the orientation of the local meridian.<\/li>\n<li>Convergence is <strong>West<\/strong> if the local meridian lies west of the datum meridian.<\/li>\n<li>Convergence is <strong>East<\/strong> if the local meridian lies east of the datum meridian.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Northern Hemisphere:<\/strong>\n<ul>\n<li>Grid convergence is opposite to the orientation of the local meridian.<\/li>\n<li>Convergence is <strong>East<\/strong> if the local meridian lies west of the datum meridian.<\/li>\n<li>Convergence is <strong>West<\/strong> if the local meridian lies east of the datum meridian.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Standard Polar Grid Chart<\/h3>\n<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-6.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<ul>\n<li>A standard polar grid chart normally uses the <strong>Greenwich Meridian<\/strong> as the datum meridian.<\/li>\n<li><strong>Isogrivs<\/strong> are lines joining places of equal grivation.<\/li>\n<li>Grid convergence is the angular difference between True North and Grid North.<\/li>\n<li>Grid navigation is based on the principle of grid convergence.<\/li>\n<\/ul>\n<h3>Chart Convergence<\/h3>\n<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-7.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<ul>\n<li>Chart convergence on grid charts follows the same principles as other chart projections.<\/li>\n<li>For <strong>Lambert Conformal Conic<\/strong> grid charts:\n<ul>\n<li><strong>Chart Convergence = Change in Longitude \u00d7 Constant of Cone<\/strong><\/li>\n<\/ul>\n<\/li>\n<li>For <strong>Polar Stereographic<\/strong> grid charts:\n<ul>\n<li><strong>Chart Convergence = Change in Longitude<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Convergence<\/h3>\n<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-8.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<ul>\n<li>Convergence depends on the relative positions of True North and Grid North.<\/li>\n<li>Convergence is <strong>East<\/strong> when True North lies east of Grid North.<\/li>\n<li>Convergence is <strong>West<\/strong> when True North lies west of Grid North.<\/li>\n<li>To convert a grid direction to a true direction:\n<ul>\n<li>If convergence is <strong>East<\/strong>, <strong>True = Grid \u2212 Convergence<\/strong> (&#8220;East is Least&#8221;).<\/li>\n<li>If convergence is <strong>West<\/strong>, <strong>True = Grid + Convergence<\/strong> (&#8220;West is Best&#8221;).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Grid Steering Using a Magnetic Compass<\/h3>\n<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-9.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<ul>\n<li><strong>Grivation<\/strong> is used to convert grid tracks directly to magnetic tracks.<\/li>\n<li>Grivation is the algebraic sum of <strong>Grid Convergence<\/strong> and <strong>Magnetic Variation<\/strong>.<\/li>\n<li>Grid steering using a magnetic compass is achieved by applying grivation.<\/li>\n<\/ul>\n<h3>Calculation of Magnetic Tracks<\/h3>\n<p> <img decoding=\"async\" src=\"https:\/\/ibexaviation.com\/page-show\/general-navigation\/g25-grid-navigation-technique-10.jpg\" alt=\"\" loading=\"lazy\"\/><\/p>\n<ul>\n<li>A grid track remains constant on a grid chart.<\/li>\n<li>Subsequent conversions follow the standard heading conversion sequence:<\/li>\n<li><strong>Grid \u2192 Convergence \u2192 True \u2192 Variation \u2192 Magnetic \u2192 Deviation \u2192 Compass<\/strong><\/li>\n<li><strong>Grivation = Convergence + Variation<\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Grid Navigation Grid Navigation is a method of navigation using a grid system of lines on a map or chart. It helps pilots identify positions, directions, and routes accurately. Grid references are used for efficient flight planning and navigation over large areas. Introduction to Grid Navigation True and magnetic directions become unreliable at high latitudes for three main reasons: Rapid meridian convergence causes true tracks to change quickly. Magnetic variation is large and changes considerably with position. The magnetic compass becomes unreliable because of the weak horizontal component of the&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"disable_featured_image":false,"footnotes":""},"categories":[324],"tags":[],"class_list":["post-14251","post","type-post","status-publish","format-standard","hentry","category-cpl-atpl-general-navigation"],"_links":{"self":[{"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/posts\/14251","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/comments?post=14251"}],"version-history":[{"count":1,"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/posts\/14251\/revisions"}],"predecessor-version":[{"id":16644,"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/posts\/14251\/revisions\/16644"}],"wp:attachment":[{"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/media?parent=14251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/categories?post=14251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibexaviation.com\/pilot-training\/wp-json\/wp\/v2\/tags?post=14251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}