{"version":"1.0","provider_name":"Serge Girard around the world","provider_url":"https:\/\/www.sergegirard.org\/en","author_name":"defi2014","author_url":"https:\/\/www.sergegirard.org\/en\/author\/defi2014\/","title":"Heading, Drift, Route \u2026. Some explanations from Pierre - Serge Girard around the world","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"XT9u6njdxw\"><a href=\"https:\/\/www.sergegirard.org\/en\/2015\/03\/25\/heading-drift-route-some-explanations-from-pierre\/\">Heading, Drift, Route \u2026. Some explanations from Pierre<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.sergegirard.org\/en\/2015\/03\/25\/heading-drift-route-some-explanations-from-pierre\/embed\/#?secret=XT9u6njdxw\" width=\"600\" height=\"338\" title=\"&#8220;Heading, Drift, Route \u2026. Some explanations from Pierre&#8221; &#8212; Serge Girard around the world\" data-secret=\"XT9u6njdxw\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script type=\"text\/javascript\">\n\/* <![CDATA[ *\/\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/* ]]> *\/\n<\/script>\n","description":"The compass on land or at sea gives the heading in relation to the magnetic north, which we must remember does not always correspond to the geographic north. This angle between the true north and the magnetic north is called magnetic declination and the angle varies a few degrees every year. When moving from a [&hellip;]"}