{"id":1717,"date":"2025-09-23T14:59:39","date_gmt":"2025-09-23T14:59:39","guid":{"rendered":"https:\/\/gfgmarine.com\/?p=1717"},"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\/ja\/articles\/why-a-compass-is-necessary-for-side-imaging\/","title":{"rendered":"\u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u306b\u30b3\u30f3\u30d1\u30b9\u304c\u5fc5\u8981\u306a\u7406\u7531"},"content":{"rendered":"<div class=\"product\"><div class=\"product\">\n<p class=\"wp-block-paragraph\">\u300c\u9b5a\u63a2\u306b\u30b3\u30f3\u30d1\u30b9\u306a\u3093\u3066\u5fc5\u8981\u306a\u306e\uff1f\u3000\u7279\u306b\u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u3067\uff1f\u300d\u3068\u601d\u3046\u65b9\u306f\u591a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h4 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class=\"wp-block-paragraph\">\u3068\u3053\u308d\u304c\u3001\u3075\u3064\u3046\u306e\u9b5a\u63a2\u306b\u306f\u78c1\u6c17\u30bb\u30f3\u30b5\u30fc\u304c\u5185\u8535\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u3064\u307e\u308a\u3001\u30dc\u30fc\u30c8\u304c\u6771\u897f\u5357\u5317\u306e\u3069\u3061\u3089\u3092\u5411\u3044\u3066\u3044\u308b\u304b\u306f\u5206\u304b\u3089\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9b5a\u63a2\u306b\u3042\u308b\u306e\u306f\u6b21\u306e\u3082\u306e\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>GPS\u53d7\u4fe1\u6a5f<\/li>\n\n\n\n<li>\u4f4d\u7f6e\u3092\u6e2c\u308b\u30a2\u30f3\u30c6\u30ca<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30c7\u30fc\u30bf\u304b\u3089\u9032\u884c\u65b9\u5411\u306f\u8a08\u7b97\u3067\u304d\u307e\u3059\u304c\u3001\u30dc\u30fc\u30c8\u304c\u5b9f\u969b\u306b\u3069\u3061\u3089\u3092\u5411\u3044\u3066\u3044\u308b\u304b\u306f\u5206\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">GPS\u304c\u30b3\u30f3\u30d1\u30b9\u306e\u4ee3\u308f\u308a\u306b\u306a\u3089\u306a\u3044\u7406\u7531<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u9b5a\u63a2\u304c\u8a08\u7b97\u3059\u308b\u9032\u884c\u65b9\u5411\u306f\u3001\u30dc\u30fc\u30c8\u306e\u4f4d\u7f6e\u304c\u6642\u9593\u3068\u3068\u3082\u306b\u3069\u3046\u52d5\u3044\u305f\u304b\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u4f4d\u7f6e\u306e\u5909\u5316\u3092\u898b\u3066\u3001\u30dc\u30fc\u30c8\u304c\u3069\u3061\u3089\u3078\u9032\u3093\u3067\u3044\u308b\u304b\u3092\u300c\u5224\u65ad\u300d\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u306b\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6d41\u308c\u306b\u30dc\u30fc\u30c8\u304c\u62bc\u3055\u308c\u3066\u3044\u308b<\/li>\n\n\n\n<li>\u98a8\u3067\u6d41\u3055\u308c\u3066\u3044\u308b<\/li>\n\n\n\n<li>\u9032\u884c\u65b9\u5411\u306b\u5bfe\u3057\u3066\u6a2a\u5411\u304d\u3084\u659c\u3081\u306b\u306a\u3063\u3066\u3044\u308b<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u9b5a\u63a2\u306f\u30dc\u30fc\u30c8\u304c\u307e\u3063\u3059\u3050\u524d\u306b\u9032\u3093\u3067\u3044\u308b\u3068\u300c\u601d\u3044\u8fbc\u307f\u300d\u307e\u3059\u304c\u3001\u5b9f\u969b\u306b\u306f\u6a2a\u5411\u304d\u3001\u3042\u308b\u3044\u306f\u5f8c\u308d\u5411\u304d\u306b\u9032\u3093\u3067\u3044\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u306e\u7d50\u679c\u3001\u30dc\u30fc\u30c8\u306b\u3068\u3063\u3066\u306e\u300c\u5de6\u300d\u3068\u300c\u53f3\u300d\u304c\u5b9f\u969b\u306b\u306f\u3069\u3061\u3089\u306a\u306e\u304b\u5206\u304b\u3089\u305a\u3001\u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u306e\u30c7\u30fc\u30bf\u304c\u3086\u304c\u3093\u3067\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u3067\u30dc\u30fc\u30c8\u306e\u5411\u304d\u304c\u5927\u5207\u306a\u7406\u7531<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u306b\u306a\u305c\u30b3\u30f3\u30d1\u30b9\u304c\u5fc5\u8981\u306a\u306e\u304b\u3001\u7c21\u5358\u306a\u4f8b\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f8b\uff1a\u30dc\u30fc\u30c8\u3068\u5ddd\u306e\u6d41\u308c<\/strong><br>\u5ddd\u3092\u5b8c\u5168\u306b\u76f4\u89d2\u306b\u6a2a\u5207\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6d41\u308c\u306e\u901f\u3055\uff1d<strong>3 km\/h<\/strong><\/li>\n\n\n\n<li>\u6c34\u306b\u5bfe\u3059\u308b\u30dc\u30fc\u30c8\u306e\u901f\u3055\uff1d<strong>4 km\/h<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3057\u304b\u3057\u3001\u5ddd\u5e95\uff08\u5730\u9762\uff09\u306b\u5bfe\u3059\u308b\u30dc\u30fc\u30c8\u306e\u901f\u3055\u306f\u3001\u3053\u306e2\u3064\u306e\u901f\u3055\u306e\u30d9\u30af\u30c8\u30eb\u306e\u548c\u306b\u306a\u308a\u307e\u3059\u3002\u76f4\u89d2\u4e09\u89d2\u5f62\u3067\u8003\u3048\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30dc\u30fc\u30c8\u306e\u901f\u3055\uff1d\u6d41\u308c\u306b\u5782\u76f4\u306a\u8fba<\/li>\n\n\n\n<li>\u6d41\u308c\u306e\u901f\u3055\uff1d\u5cb8\u306b\u5e73\u884c\u306a\u8fba<\/li>\n\n\n\n<li>\u5b9f\u969b\u306e\u901f\u3055\uff1d\u659c\u8fba<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e09\u5e73\u65b9\u306e\u5b9a\u7406\u3067\u8a08\u7b97\u3059\u308b\u3068<\/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\">\u3064\u307e\u308a\u30014 km\/h\u3067\u5ddd\u3092\u300c\u771f\u6a2a\u306b\u300d\u6e21\u308d\u3046\u3068\u3057\u3066\u3082\u3001\u5ddd\u5e95\u306b\u5bfe\u3059\u308b\u5b9f\u969b\u306e\u52d5\u304d\u306f\u659c\u3081\u306b\u306a\u308a\u3001\u305d\u306e\u901f\u3055\u306f5 km\/h\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u3068\u306e\u95a2\u4fc2<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u306e\u632f\u52d5\u5b50\u306f\u3001\u5e38\u306b\u8239\u306e\u8ef8\u306b\u5bfe\u3057\u3066\u76f4\u89d2\u306b\u50cd\u304d\u307e\u3059\u3002\u3068\u3053\u308d\u304c\u3053\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u306f\u3001GPS\u3067\u8a08\u7b97\u3057\u305f\u9032\u884c\u65b9\u5411\u3068\u30dc\u30fc\u30c8\u306e\u5b9f\u969b\u306e\u5411\u304d\u304c\u305a\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u306e\u7d50\u679c\u3001<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8239\u9996\u306f\u3042\u308b\u65b9\u5411\u3092\u5411\u3044\u3066\u3044\u308b\u306e\u306b\u3001<\/li>\n\n\n\n<li>\u5b9f\u969b\u306b\u306f\u6d41\u308c\u306b\u4e57\u3063\u3066\u659c\u3081\u306b\u9032\u3093\u3067\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u306e\u305f\u3081\u3001\u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u306e\u753b\u9762\u3067\u30de\u30fc\u30af\u3057\u305f\u4f4d\u7f6e\u306f\u5927\u304d\u304f\u305a\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>\u300c\u9b5a\u63a2\u306b\u30b3\u30f3\u30d1\u30b9\u306a\u3093\u3066\u5fc5\u8981\u306a\u306e\uff1f\u3000\u7279\u306b\u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u3067\uff1f\u300d\u3068\u601d\u3046\u65b9\u306f\u591a\u3044\u3067\u3057\u3087\u3046\u3002 \u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u306b\u30b3\u30f3\u30d1\u30b9\u304c\u5fc5\u8981\u306a\u7406\u7531 \u30b5\u30a4\u30c9\u30a4\u30e1\u30fc\u30b8\u306e\u632f\u52d5\u5b50\u306f\u3001\u8239\u4f53\uff08\u591a\u304f\u306f\u30c8\u30e9\u30f3\u30b5\u30e0\uff09\u306b\u3057\u3063\u304b\u308a\u56fa\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5f79\u76ee\u306f\u3001\u8239\u306e\u8ef8\u306b\u5bfe\u3057 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