{"id":1714,"date":"2025-09-23T14:59:39","date_gmt":"2025-09-23T14:59:39","guid":{"rendered":"https:\/\/gfgmarine.com\/?p=1714"},"modified":"2026-11-11T17:46:51","modified_gmt":"2026-11-11T17:46:51","slug":"why-a-compass-is-necessary-for-side-imaging","status":"publish","type":"post","link":"https:\/\/gfgmarine.com\/fr\/articles\/why-a-compass-is-necessary-for-side-imaging\/","title":{"rendered":"Pourquoi l&rsquo;imagerie lat\u00e9rale a besoin d&rsquo;un compas"},"content":{"rendered":"<div class=\"product\"><div class=\"product\">\n<p class=\"wp-block-paragraph\">Beaucoup se demandent : pourquoi un sondeur aurait-il besoin d&rsquo;un compas, surtout en imagerie lat\u00e9rale ?<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Pourquoi l&rsquo;imagerie lat\u00e9rale a besoin d&rsquo;un compas<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">La sonde d&rsquo;imagerie lat\u00e9rale est fix\u00e9e rigidement \u00e0 la coque, le plus souvent sur le tableau arri\u00e8re. Son r\u00f4le est d&rsquo;\u00e9mettre un signal strictement perpendiculaire \u00e0 l&rsquo;axe du bateau. C&rsquo;est ainsi que la populaire <strong>sonde GT56<\/strong> construit son image.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Or un sondeur classique n&rsquo;a pas de capteur magn\u00e9tique int\u00e9gr\u00e9. Il ne peut donc pas conna\u00eetre l&rsquo;orientation r\u00e9elle du bateau par rapport aux points cardinaux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il ne dispose que :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>d&rsquo;un r\u00e9cepteur GPS ;<\/li>\n\n\n\n<li>d&rsquo;une antenne pour calculer la position.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c0 partir de ces donn\u00e9es, l&rsquo;appareil calcule la route, mais pas l&rsquo;orientation r\u00e9elle du bateau.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Pourquoi le GPS ne remplace pas un compas<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">La route calcul\u00e9e par le sondeur repose sur le d\u00e9placement du bateau dans le temps. Autrement dit, l&rsquo;appareil analyse les changements de position et \u00ab comprend \u00bb o\u00f9 va le bateau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mais voil\u00e0 le probl\u00e8me :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>si le bateau est entra\u00een\u00e9 par le courant,<\/li>\n\n\n\n<li>s&rsquo;il d\u00e9rive avec le vent,<\/li>\n\n\n\n<li>s&rsquo;il est de travers ou en biais par rapport \u00e0 sa direction de d\u00e9placement,<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">le sondeur \u00ab pense \u00bb que le bateau avance tout droit, alors qu&rsquo;en r\u00e9alit\u00e9 il peut avancer de c\u00f4t\u00e9, voire par l&rsquo;arri\u00e8re.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">R\u00e9sultat : les donn\u00e9es d&rsquo;imagerie lat\u00e9rale sont fauss\u00e9es, car l&rsquo;appareil ne sait pas o\u00f9 sont r\u00e9ellement la \u00ab gauche \u00bb et la \u00ab droite \u00bb du bateau.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Pourquoi l&rsquo;orientation r\u00e9elle du bateau compte en imagerie lat\u00e9rale<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Pour comprendre pourquoi l&rsquo;imagerie lat\u00e9rale a besoin d&rsquo;un compas, prenons un exemple simple.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exemple : un bateau et le courant d&rsquo;une rivi\u00e8re<\/strong><br>Imaginons que vous traversiez une rivi\u00e8re parfaitement \u00e0 angle droit.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vitesse du courant = <strong>3 km\/h<\/strong><\/li>\n\n\n\n<li>Vitesse du bateau par rapport \u00e0 l&rsquo;eau = <strong>4 km\/h<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Mais la vitesse du bateau par rapport au fond sera la somme vectorielle de ces deux vitesses. Pour le visualiser, imaginez un triangle rectangle :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>vitesse du bateau = c\u00f4t\u00e9 perpendiculaire au courant<\/li>\n\n\n\n<li>vitesse du courant = c\u00f4t\u00e9 parall\u00e8le \u00e0 la rive<\/li>\n\n\n\n<li>vitesse r\u00e9sultante = hypot\u00e9nuse<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Calcul avec le th\u00e9or\u00e8me de Pythagore<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>V = \u221a(Vboat\u00b2 + Vcurrent\u00b2)\n\nV = \u221a(4\u00b2 + 3\u00b2) = \u221a(16 + 9) = \u221a25 = 5 km\/h\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ainsi, pour traverser la rivi\u00e8re \u00ab bien perpendiculairement \u00bb \u00e0 4 km\/h, le d\u00e9placement r\u00e9el par rapport au fond se fait en diagonale, \u00e0 une vitesse r\u00e9sultante de 5 km\/h.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Le lien avec l&rsquo;imagerie lat\u00e9rale<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">La sonde d&rsquo;imagerie lat\u00e9rale travaille toujours \u00e0 angle droit par rapport \u00e0 l&rsquo;axe du bateau. Mais dans ces conditions, la route calcul\u00e9e par GPS s&rsquo;\u00e9carte de l&rsquo;orientation r\u00e9elle du bateau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">R\u00e9sultat :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>l&rsquo;\u00e9trave pointe dans une direction,<\/li>\n\n\n\n<li>mais le bateau avance en diagonale avec le courant.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Les positions que vous marquez sur l&rsquo;\u00e9cran d&rsquo;imagerie lat\u00e9rale seront donc tr\u00e8s impr\u00e9cises.<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Beaucoup se demandent : pourquoi un sondeur aurait-il besoin d&rsquo;un compas, surtout en imagerie lat\u00e9rale ? Pourquoi l&rsquo;imagerie lat\u00e9rale a besoin d&rsquo;un compas La sonde d&rsquo;imagerie lat\u00e9rale est fix\u00e9e rigidement \u00e0 la coque, le plus souvent sur le tableau arri\u00e8re. Son r\u00f4le est d&rsquo;\u00e9mettre un signal strictement perpendiculaire \u00e0 l&rsquo;axe du bateau. C&rsquo;est ainsi que [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jf_save_progress":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[112,120,128,96],"tags":[],"class_list":["post-1714","post","type-post","status-publish","format-standard","hentry","category-garmin","category-humminbird","category-lowrance","category-echosounder-chartplotter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pourquoi l&#039;imagerie lat\u00e9rale a besoin d&#039;un compas : route GPS et cap du bateau | GFG<\/title>\n<meta name=\"description\" content=\"Sans capteur de cap, un sondeur ne conna\u00eet que la route GPS, pas la direction de l&#039;\u00e9trave. 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