{"id":3071,"date":"2015-03-25T11:54:05","date_gmt":"2015-03-25T10:54:05","guid":{"rendered":"http:\/\/www.sergegirard.org\/fr\/?p=3071"},"modified":"2015-03-26T12:41:03","modified_gmt":"2015-03-26T11:41:03","slug":"cap-derive-route-quelques-explications","status":"publish","type":"post","link":"https:\/\/www.sergegirard.org\/fr\/2015\/03\/25\/cap-derive-route-quelques-explications\/","title":{"rendered":"Cap, D\u00e9rive, Route \u2026. quelques explications de Pierre"},"content":{"rendered":"<p>Le compas, pour les marins, ou la boussole pour les terriens, donne un cap par rapport au Nord magn\u00e9tique, il faut savoir que sur terre, le Nord magn\u00e9tique ne correspond pas tout \u00e0 fait avec le Nord g\u00e9ographique et que cet \u00e9cart, de quelques degr\u00e9s, est appel\u00e9 d\u00e9viation, cette d\u00e9viation<br \/>\n\u00e9volue de quelques minutes d&rsquo;angle chaque ann\u00e9e et il faut en tenir compte lorsque l&rsquo;on passe de la carte au compas ou du compas \u00e0 la carte.<br \/>\nUn bateau qui navigue avec une certaine vitesse vers un point, fait route \u00e0 la surface de l&rsquo;eau suivant un cap ( angle par rapport au Nord magn\u00e9tique) ce bateau se d\u00e9place sur la mer en subissant des forces diff\u00e9rentes qui peuvent l&rsquo;\u00e9carter de sa \u00ab trajectoire \u00bb, ces forces peuvent agir sous forme de vent ou de courant, ce qui se traduit par de la d\u00e9rive, c&rsquo;est \u00e0 dire que la route vraie que fera le bateau \u00e0 la surface ne correspondra plus \u00e0 la route qu&rsquo;il fera sur le fond<br \/>\nN&rsquo;importe quel engin flottant, \u00e0 moteur, \u00e0 voile, \u00e0 pagaie sera soumis aux m\u00eames d\u00e9rives, en sachant que plus le bateau sera haut sur l&rsquo;eau, ou plus il sera l\u00e9ger, donc de surface mouill\u00e9e plus faible, plus il subira la d\u00e9rive due au vent. Middleton, le bateau de Serge, est dans ce cas de figure.<br \/>\nIl faut donc imp\u00e9rativement tenir compte de ces \u00e9l\u00e9ments pour calculer un cap \u00e0 donner au bateau pour qu&rsquo;il puisse se rendre d&rsquo;un point \u00e0 un autre et surveiller les changements de force et direction du vent et du courant afin de modifier le cap pour ne pas rater le point que l&rsquo; on souhaite atteindre.<br \/>\nUne aide pr\u00e9cieuse \u00e0 la navigation est apport\u00e9e par le GPS, car \u00e0 tout moment, le navigateur peut savoir quelle est sa position pr\u00e9cise par rapport au fond de l&rsquo;eau.<br \/>\nLa nuit ou en p\u00e9riode de repos, sans personne aux avirons pour donner de la vitesse \u00e0 Middleton, le bateau de Serge d\u00e9rivera en fonction de la force et de la direction du vent et du courant, Serge pourra compenser un peu la trajectoire du bateau en agissant sur les parties mobiles du bateau, le safran ou gouvernail et la d\u00e9rive( petite planche qui coulisse verticalement dans l&rsquo;eau et r\u00e9duit un peu le \u00ab glissement lat\u00e9ral\u00bb ( d\u00e9rive ) du bateau . Bien \u00e9videmment Serge se r\u00e9veillera tr\u00e8s r\u00e9guli\u00e8rement pour v\u00e9rifier qu&rsquo;il ne s&rsquo;\u00e9loigne pas trop de son cap id\u00e9al et si c&rsquo;est le cas de rectifier la trajectoire en r\u00e9glant les appendices.<br \/>\nPierre Katz<\/p>\n<p>Serge n&rsquo;aura parcouru que 30 milles nautiques les derniers 24H00 avec toujours un vent et une houle qui le pousse inexorablement trop \u00e0 l&rsquo;ouest plut\u00f4t que vers le nord. les conditions devraient s&rsquo;am\u00e9liorer aujourd&rsquo;hui et demain. Suivez sa trace vers Sainte Marie&#8230;<br \/>\n\n<div class=\"ngg-galleryoverview ngg-slideshow\"\n\tid=\"ngg-slideshow-f84848dd5ad558e49b6fcea05fdbcb55-9239434970\"\n\tdata-gallery-id=\"f84848dd5ad558e49b6fcea05fdbcb55\"\n\tstyle=\"max-width: 700px;\n\t\t\tmax-height: 467px;\n\t\t\tdisplay: none;\">\n\n\t\n\t\t<a href=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_000.JPG\"\n\t\t\ttitle=\"Le Compas de navigation\"\n\t\t\tdata-src=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_000.JPG\"\n\t\t\tdata-thumbnail=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/thumbs\/thumbs_20150325_000.JPG\"\n\t\t\tdata-image-id=\"418\"\n\t\t\tdata-title=\"20150325_000.JPG\"\n\t\t\tdata-description=\"Le Compas de navigation\"\n\t\t\tclass=\"ngg-simplelightbox\" rel=\"f84848dd5ad558e49b6fcea05fdbcb55\">\n\n\t\t\t<img data-image-id='418'\n\t\t\t\ttitle=\"Le Compas de navigation\"\n\t\t\t\talt=\"20150325_000.JPG\"\n\t\t\t\tsrc=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_000.JPG\"\n\t\t\t\tstyle=\"max-height: 447px;\"\/>\n\t\t<\/a>\n\n\t\t\n\t\t<a href=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_001.JPG\"\n\t\t\ttitle=\"L&#039;ile Sainte Marie o\u00f9 Serge doit arriver\"\n\t\t\tdata-src=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_001.JPG\"\n\t\t\tdata-thumbnail=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/thumbs\/thumbs_20150325_001.JPG\"\n\t\t\tdata-image-id=\"419\"\n\t\t\tdata-title=\"20150325_001.JPG\"\n\t\t\tdata-description=\"L&#039;ile Sainte Marie o\u00f9 Serge doit arriver\"\n\t\t\tclass=\"ngg-simplelightbox\" rel=\"f84848dd5ad558e49b6fcea05fdbcb55\">\n\n\t\t\t<img data-image-id='419'\n\t\t\t\ttitle=\"L&#039;ile Sainte Marie o\u00f9 Serge doit arriver\"\n\t\t\t\talt=\"20150325_001.JPG\"\n\t\t\t\tsrc=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_001.JPG\"\n\t\t\t\tstyle=\"max-height: 447px;\"\/>\n\t\t<\/a>\n\n\t\t\n\t\t<a href=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_002.JPG\"\n\t\t\ttitle=\"Notre QG du TDM sur Sainte Marie\"\n\t\t\tdata-src=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_002.JPG\"\n\t\t\tdata-thumbnail=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/thumbs\/thumbs_20150325_002.JPG\"\n\t\t\tdata-image-id=\"420\"\n\t\t\tdata-title=\"20150325_002.JPG\"\n\t\t\tdata-description=\"Notre QG du TDM sur Sainte Marie\"\n\t\t\tclass=\"ngg-simplelightbox\" rel=\"f84848dd5ad558e49b6fcea05fdbcb55\">\n\n\t\t\t<img data-image-id='420'\n\t\t\t\ttitle=\"Notre QG du TDM sur Sainte Marie\"\n\t\t\t\talt=\"20150325_002.JPG\"\n\t\t\t\tsrc=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_002.JPG\"\n\t\t\t\tstyle=\"max-height: 447px;\"\/>\n\t\t<\/a>\n\n\t\t\n\t\t<a href=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_003.JPG\"\n\t\t\ttitle=\"Merci \u00e0 Henry de son hospitalit\u00e9.\"\n\t\t\tdata-src=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_003.JPG\"\n\t\t\tdata-thumbnail=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/thumbs\/thumbs_20150325_003.JPG\"\n\t\t\tdata-image-id=\"421\"\n\t\t\tdata-title=\"20150325_003.JPG\"\n\t\t\tdata-description=\"Merci \u00e0 Henry de son hospitalit\u00e9.\"\n\t\t\tclass=\"ngg-simplelightbox\" rel=\"f84848dd5ad558e49b6fcea05fdbcb55\">\n\n\t\t\t<img data-image-id='421'\n\t\t\t\ttitle=\"Merci \u00e0 Henry de son hospitalit\u00e9.\"\n\t\t\t\talt=\"20150325_003.JPG\"\n\t\t\t\tsrc=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_003.JPG\"\n\t\t\t\tstyle=\"max-height: 447px;\"\/>\n\t\t<\/a>\n\n\t\t\n\t\t<a href=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_004.JPG\"\n\t\t\ttitle=\"Ce n&#039;est pas une sculpture mais un vrai l\u00e9zard\"\n\t\t\tdata-src=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_004.JPG\"\n\t\t\tdata-thumbnail=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/thumbs\/thumbs_20150325_004.JPG\"\n\t\t\tdata-image-id=\"422\"\n\t\t\tdata-title=\"20150325_004.JPG\"\n\t\t\tdata-description=\"Ce n&#039;est pas une sculpture mais un vrai l\u00e9zard\"\n\t\t\tclass=\"ngg-simplelightbox\" rel=\"f84848dd5ad558e49b6fcea05fdbcb55\">\n\n\t\t\t<img data-image-id='422'\n\t\t\t\ttitle=\"Ce n&#039;est pas une sculpture mais un vrai l\u00e9zard\"\n\t\t\t\talt=\"20150325_004.JPG\"\n\t\t\t\tsrc=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_004.JPG\"\n\t\t\t\tstyle=\"max-height: 447px;\"\/>\n\t\t<\/a>\n\n\t\t\n\t\t<a href=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_005.JPG\"\n\t\t\ttitle=\"M\u00eame les tortues aiment le riz\"\n\t\t\tdata-src=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_005.JPG\"\n\t\t\tdata-thumbnail=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/thumbs\/thumbs_20150325_005.JPG\"\n\t\t\tdata-image-id=\"423\"\n\t\t\tdata-title=\"20150325_005.JPG\"\n\t\t\tdata-description=\"M\u00eame les tortues aiment le riz\"\n\t\t\tclass=\"ngg-simplelightbox\" rel=\"f84848dd5ad558e49b6fcea05fdbcb55\">\n\n\t\t\t<img data-image-id='423'\n\t\t\t\ttitle=\"M\u00eame les tortues aiment le riz\"\n\t\t\t\talt=\"20150325_005.JPG\"\n\t\t\t\tsrc=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_005.JPG\"\n\t\t\t\tstyle=\"max-height: 447px;\"\/>\n\t\t<\/a>\n\n\t\t\n\t\t<a href=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_006.JPG\"\n\t\t\ttitle=\"Lyo Food: Fruits et Petit-Dej\"\n\t\t\tdata-src=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_006.JPG\"\n\t\t\tdata-thumbnail=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/thumbs\/thumbs_20150325_006.JPG\"\n\t\t\tdata-image-id=\"424\"\n\t\t\tdata-title=\"20150325_006.JPG\"\n\t\t\tdata-description=\"Lyo Food: Fruits et Petit-Dej\"\n\t\t\tclass=\"ngg-simplelightbox\" rel=\"f84848dd5ad558e49b6fcea05fdbcb55\">\n\n\t\t\t<img data-image-id='424'\n\t\t\t\ttitle=\"Lyo Food: Fruits et Petit-Dej\"\n\t\t\t\talt=\"20150325_006.JPG\"\n\t\t\t\tsrc=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_006.JPG\"\n\t\t\t\tstyle=\"max-height: 447px;\"\/>\n\t\t<\/a>\n\n\t\t\n\t\t<a href=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_007.JPG\"\n\t\t\ttitle=\"Choix des menus entre 9 plats\"\n\t\t\tdata-src=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_007.JPG\"\n\t\t\tdata-thumbnail=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/thumbs\/thumbs_20150325_007.JPG\"\n\t\t\tdata-image-id=\"425\"\n\t\t\tdata-title=\"20150325_007.JPG\"\n\t\t\tdata-description=\"Choix des menus entre 9 plats\"\n\t\t\tclass=\"ngg-simplelightbox\" rel=\"f84848dd5ad558e49b6fcea05fdbcb55\">\n\n\t\t\t<img data-image-id='425'\n\t\t\t\ttitle=\"Choix des menus entre 9 plats\"\n\t\t\t\talt=\"20150325_007.JPG\"\n\t\t\t\tsrc=\"https:\/\/www.sergegirard.org\/fr\/wp-content\/uploads\/sites\/3\/nggallery\/j18-marcredi-25-mars\/20150325_007.JPG\"\n\t\t\t\tstyle=\"max-height: 447px;\"\/>\n\t\t<\/a>\n\n\t\t<\/div>\n\n\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le compas, pour les marins, ou la boussole pour les terriens, donne un cap par rapport au Nord magn\u00e9tique, il faut savoir que sur terre, le Nord magn\u00e9tique ne correspond pas tout \u00e0 fait avec le Nord g\u00e9ographique et que cet \u00e9cart, de quelques degr\u00e9s, est appel\u00e9 d\u00e9viation, cette d\u00e9viation \u00e9volue de quelques minutes d&rsquo;angle [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-3071","post","type-post","status-publish","format-standard","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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