{"id":11754,"date":"2022-04-19T06:45:00","date_gmt":"2022-04-19T06:45:00","guid":{"rendered":"https:\/\/daivings.lv\/?p=11754"},"modified":"2026-04-19T06:48:31","modified_gmt":"2026-04-19T06:48:31","slug":"tac-100-underwater-navigation-board","status":"publish","type":"post","link":"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/","title":{"rendered":"TAC-100 Underwater Navigation Board"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><strong>TAC-100 Underwater Navigation Board<\/strong> is the navigation standard for military divers worldwide. It is a compact, durable and reliable platform that allows special operations divers to navigate accurately underwater where visibility is limited and GPS signals are unavailable. Below is a detailed technical description of this tool, its applications and training specifics.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Contents\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/#Funkcijas_un_konstrukcija\" >Functions and design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/#Nozime_un_uzdevumi\" >Meaning and tasks<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/#Trenini_un_metodika\" >Training and methodology<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/#Attaluma_merisana_Kaju_vezienu_skaitisana\" >Distance measurement (Leg stroke counting)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/#Kursa_turesana\" >Staying on course<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/#Demo_misija_%E2%80%9CKlusais_Enkurs%E2%80%9D\" >Demo Mission: \u201cSilent Anchor\u201d<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/#Misijas_parametri\" >Mission parameters:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/#Izpildes_gaita\" >Execution progress:<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Funkcijas_un_konstrukcija\"><\/span>Functions and design<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The TAC-100 is not just a board; it is an integrated navigation system, with every element playing a critical role.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Board:<\/strong> Made of high density, black ABS plastic or polycarbonate, it has a slight negative or neutral buoyancy, which provides stability when held in both hands.<\/li>\n\n\n\n<li><strong>Magnetic compass (TAC100-2):<\/strong> The main element. It is liquid-filled, has a large, easy-to-read dial, and luminescent markings for night operations.<\/li>\n\n\n\n<li><strong>Digital depth gauge and stopwatch:<\/strong> There is space on the board for an electronic depth gauge that shows the current depth and dive time. Time is a critical variable for calculating distance traveled.<\/li>\n\n\n\n<li><strong>Buoyancy control:<\/strong> Ergonomic handles on both sides allow the diver to hold the board directly in front of them at eye level, ensuring the compass is in a horizontal position for accurate readings.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Nozime_un_uzdevumi\"><\/span>Meaning and tasks<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In modern warfare, underwater navigation is the key to \u201cstealth.\u201d The TAC-100\u2019s primary missions are:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Infiltration:<\/strong> Getting from a base ship or point of departure to a target object (e.g., an enemy port) without surfacing.<\/li>\n\n\n\n<li><strong>Mine search and destruction:<\/strong> Accurate square searching using course and time tracking.<\/li>\n\n\n\n<li><strong>Survey of objects:<\/strong> Searching ship hulls or underwater infrastructure.<\/li>\n\n\n\n<li><strong>Extraction:<\/strong> Safe return to the collection point after completing the task.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" src=\"https:\/\/daivings.lv\/wp-content\/uploads\/2026\/04\/TAC-100-Underwater-Navigation-Board.png\" alt=\"\" class=\"wp-image-11756\" srcset=\"https:\/\/daivings.lv\/wp-content\/uploads\/2026\/04\/TAC-100-Underwater-Navigation-Board.png?v=1776581045 1000w, https:\/\/daivings.lv\/wp-content\/uploads\/2026\/04\/TAC-100-Underwater-Navigation-Board-300x300.png?v=1776581045 300w, https:\/\/daivings.lv\/wp-content\/uploads\/2026\/04\/TAC-100-Underwater-Navigation-Board-150x150.png?v=1776581045 150w, https:\/\/daivings.lv\/wp-content\/uploads\/2026\/04\/TAC-100-Underwater-Navigation-Board-768x768.png?v=1776581045 768w, https:\/\/daivings.lv\/wp-content\/uploads\/2026\/04\/TAC-100-Underwater-Navigation-Board-12x12.png?v=1776581045 12w, https:\/\/daivings.lv\/wp-content\/uploads\/2026\/04\/TAC-100-Underwater-Navigation-Board-230x230.png?v=1776581045 230w, https:\/\/daivings.lv\/wp-content\/uploads\/2026\/04\/TAC-100-Underwater-Navigation-Board-350x350.png?v=1776581045 350w, https:\/\/daivings.lv\/wp-content\/uploads\/2026\/04\/TAC-100-Underwater-Navigation-Board-480x480.png?v=1776581045 480w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Trenini_un_metodika\"><\/span>Training and methodology<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Training with the TAC-100 begins in the pool and gradually moves to open water with zero visibility. The main methodology is based on <strong>Dead Reckoning (DR)<\/strong> principle.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Attaluma_merisana_Kaju_vezienu_skaitisana\"><\/span>Distance measurement (Leg stroke counting)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Divers need to know their personal \u201cspeed.\u201d<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>During training, the time or kicks needed to swim are measured. <strong>30 meters<\/strong> or <strong>100 meters<\/strong>.<\/li>\n\n\n\n<li>Knowing his average speed, the diver can calculate the distance:$$Distance = Speed \\times Time$$<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Kursa_turesana\"><\/span>Staying on course<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">&quot;Triangulation&quot; and underwater course changes (e.g., swimming in an &quot;L&quot; or &quot;Z&quot; shape) are practiced, maintaining accuracy of up to 1-2 degrees.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Demo_misija_%E2%80%9CKlusais_Enkurs%E2%80%9D\"><\/span>Demo Mission: \u201cSilent Anchor\u201d<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Purpose:<\/strong> Conduct covert infiltration and place a mock mine on the anchor chain of the target ship.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Misijas_parametri\"><\/span>Mission parameters:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Drop-off point:<\/strong> 400 meters from the shoreline.<\/li>\n\n\n\n<li><strong>Purpose:<\/strong> Port Pier No. 4.<\/li>\n\n\n\n<li><strong>Depth:<\/strong> 6-8 meters.<\/li>\n\n\n\n<li><strong>Navigation plan:<\/strong><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Stage<\/strong><\/td><td><strong>Course (Azimuth)<\/strong><\/td><td><strong>Distance\/Time<\/strong><\/td><td><strong>Task<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Stage 1<\/strong><\/td><td>045\u00b0<\/td><td>150 meters (about 5 min)<\/td><td>Infiltration from the drop-off point<\/td><\/tr><tr><td><strong>Stage 2<\/strong><\/td><td>090\u00b0<\/td><td>100 meters (about 3 min)<\/td><td>Avoiding Coast Patrol Sensors<\/td><\/tr><tr><td><strong>Stage 3<\/strong><\/td><td>010\u00b0<\/td><td>150 meters (to the target)<\/td><td>Approaching the target ship<\/td><\/tr><tr><td><strong>Stage 4<\/strong><\/td><td>190\u00b0<\/td><td>Return<\/td><td>Extraction after mine installation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Izpildes_gaita\"><\/span>Execution progress:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Pre-dive check:<\/strong> The Point Man sets the compass to 045\u00b0. The Buddy checks the stopwatch.<\/li>\n\n\n\n<li><strong>Diving:<\/strong> Upon reaching a depth of 6 meters, the divers assume a horizontal position. Point Man holds the TAC-100 and focuses solely on the course.<\/li>\n\n\n\n<li><strong>Control:<\/strong> Every 50 meters, the partner confirms the depth and air consumption with a hand signal.<\/li>\n\n\n\n<li><strong>Goal achievement:<\/strong> Upon reaching the target distance (by time\/waves), the team performs a visual identification. If visibility is 0, a feeler or sonar is used.<\/li>\n\n\n\n<li><strong>Demining\/mining the object:<\/strong> After completing the task, the board is turned 180\u00b0 (return course), and the team heads to the evacuation area.<\/li>\n<\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Important note:<\/strong> The effectiveness of the TAC-100 is directly dependent on the diver&#039;s ability to remain calm and maintain a constant swimming pace. Any panic or rapid movement will shift the compass, which can cause a deviation of up to 50 meters from the target at a distance of 500 meters.<\/p>\n<\/blockquote>","protected":false},"excerpt":{"rendered":"<p>The TAC-100 Underwater Navigation Board is the navigation standard for military divers worldwide. It is a compact, rugged, and reliable platform that allows special operations divers to navigate accurately underwater where visibility is limited and GPS signals are unavailable. Below is a detailed technical [\u2026]<\/p>","protected":false},"author":171,"featured_media":11755,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[18,432],"class_list":["post-11754","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-daivinga-ekipejums","tag-daivings","tag-rebreather-instructor"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TAC-100 Underwater Navigation Board - Daivings.lv<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/daivings.lv\/en\/tac-100-underwater-navigation-board\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TAC-100 Underwater Navigation Board - Daivings.lv\" \/>\n<meta property=\"og:description\" content=\"TAC-100 Underwater Navigation Board ir milit\u0101ro \u016bdensl\u012bd\u0113ju navig\u0101cijas standarts vis\u0101 pasaul\u0113. 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