{"id":317,"date":"2020-12-08T18:21:15","date_gmt":"2020-12-08T18:21:15","guid":{"rendered":"https:\/\/maritimesa.org\/nautical-science-grade-10\/?p=317"},"modified":"2020-12-08T19:05:01","modified_gmt":"2020-12-08T19:05:01","slug":"the-observed-position-and-dead-reckoning-position","status":"publish","type":"post","link":"https:\/\/maritimesa.org\/nautical-science-grade-10\/2020\/12\/08\/the-observed-position-and-dead-reckoning-position\/","title":{"rendered":"The observed position and dead reckoning position (DR)"},"content":{"rendered":"

The observed position.<\/h4>\n

The position obtained by the intersection of two or more position lines obtained from the observation of heavenly bodies is known as the observed position. It is shown on the chart as a dot surrounded by a circle, with \u201cObs\u201d and the time written next to it.<\/p>\n

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Observed position formed by the intersection of three astro position lines.<\/p><\/div>\n

Dead reckoning position (DR).<\/h4>\n

A position obtained from the course steered by the ship and her speed through the water and nothing else is known as \u201c a dead reckoning position\u201d and is only an approximate position. The name \u201cdead reckoning\u201d comes from \u201cdeduced reckoning\u201d which was abbreviated to \u201cded reckoning\u201d and later became \u201cdead reckoning\u201d. It is marked on the chart as a small cross with the time alongside it.<\/p>\n

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Ship\u2019s track with three dead reckoning positions.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

The observed position. The position obtained by the intersection of two or more position lines obtained from the observation of heavenly bodies is known as the observed position. It is shown on the chart as a dot surrounded by a circle, with \u201cObs\u201d and the time written next to it. […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,28,31],"tags":[],"class_list":["post-317","post","type-post","status-publish","format-standard","hentry","category-10-1-navigation","category-10-1-5-chartwork-plotting-and-chart-symbols","category-10-1-5-3-the-observed-position-and-dead-reckoning-position"],"_links":{"self":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/posts\/317"}],"collection":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/comments?post=317"}],"version-history":[{"count":4,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/posts\/317\/revisions"}],"predecessor-version":[{"id":323,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/posts\/317\/revisions\/323"}],"wp:attachment":[{"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/media?parent=317"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/categories?post=317"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/maritimesa.org\/nautical-science-grade-10\/wp-json\/wp\/v2\/tags?post=317"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}