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Gold Prospecting
Gold Maps & Resources
Co-ordinates confusion
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<blockquote data-quote="condor22" data-source="post: 564342" data-attributes="member: 1932"><p>near Bendigo 1000M is about 40 seconds of longitude</p><p></p><p>Therefore 1 second = approx 25 metres</p><p></p><p>Before getting into GPS accuracy you need to look at the quality of the GPS, age, accuracy. size of antenna etc etc.</p><p></p><p>No 2 GPS units will give identical readings. If you are within 10 M of the coordinates, be happy with that from a handheld. My E20 will state accuracy of 3 M at times, I don't accept that as Gospel.</p><p></p><p>If you want to be absolute, be prepared to spend in excess of $30,000 for a survey unit. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> They not only use satellite but are augmented by known fixed ground telemetry.</p><p></p><p>PS the figure of 40 seconds for 1km is at 33.5 degrees south, at the poles it's bugger all and at the equator much further, so the distance varies depending on Latitude.</p></blockquote><p></p>
[QUOTE="condor22, post: 564342, member: 1932"] near Bendigo 1000M is about 40 seconds of longitude Therefore 1 second = approx 25 metres Before getting into GPS accuracy you need to look at the quality of the GPS, age, accuracy. size of antenna etc etc. No 2 GPS units will give identical readings. If you are within 10 M of the coordinates, be happy with that from a handheld. My E20 will state accuracy of 3 M at times, I don't accept that as Gospel. If you want to be absolute, be prepared to spend in excess of $30,000 for a survey unit. :) They not only use satellite but are augmented by known fixed ground telemetry. PS the figure of 40 seconds for 1km is at 33.5 degrees south, at the poles it's bugger all and at the equator much further, so the distance varies depending on Latitude. [/QUOTE]
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Co-ordinates confusion
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