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Do you really not see what the issue may be with constantly broadcasting a sonar signal would be from a military submarine?
by chrisseaton 5y ago
Do you really not see what the issue may be with constantly broadcasting a sonar signal would be from a military submarine?
- hilbert42 5y agoSee my other posts - they should not have had to have had sonar on to detect the seamount. My question, is why did the two other alternatives not work (i.e.: inertial navigation and gravity detection)?
- chrisseaton 5y agoThe Garmin device they’re talking about is active sonar. That means it makes a big noise. It’s like shining a light into a dark room - everyone can see where the light is coming from.
- wil421 5y agoWhat do you keep talking about on this thread regarding gravity detection? Please link to a device that does that. Google only brings up gravity wave detectors. How is inertial navigation supposed to work for an unmapped seamount? Sure that works for known seamounts but how’s that going to help around things that move due to tectonic plates or undersea volcanos? Or in unmapped or mis-mapped regions?
- hilbert42 5y agoI cannot believe there's any argument about this. There are literally thousands of references. Below, are links to the first few references that I found. Note: you'll see that in the first link in item #5 the comment about the strategic nature of this information, that means don't expect to get how-to-do-it plans from the military but you can bet your house to a brick that the military is deeply involved in gravity detection (specifically because, like inertial navigation, it's silent and doesn't broadcast its presence). Also note the dates, this stuff goes back to even before the 1970s, the technology is now very mature. "Google only brings up gravity wave detectors." See Google's patent in item #5. ___ Links as requested: 1. General Information/Overview https://en.wikipedia.org/wiki/Gravity_anomaly https://en.wikipedia.org/wiki/Gravity_anomaly https://en.wikipedia.org/wiki/Gravity_gradiometry https://en.wikipedia.org/wiki/Gravity_gradiometry https://csegrecorder.com/articles/view/magnetic-and-gravity-methods-in-mineral-exploration https://csegrecorder.com/articles/view/magnetic-and-gravity-... https://www.911metallurgist.com/blog/wp-content/uploads/2015/10/Airborne-Gravity-Gradiometry-in-The-Search-for-Mineral-Deposits.pdf https://www.911metallurgist.com/blog/wp-content/uploads/2015... http://www.ga.gov.au/pdf/RR0027.pdf http://www.ga.gov.au/pdf/RR0027.pdf 2. Commercial https://www.geologyforinvestors.com/gravity-surveys/ https://www.geologyforinvestors.com/gravity-surveys/ 3. Underwater https://www.whoi.edu/cms/files/08oceans-1_41284.pdf https://www.whoi.edu/cms/files/08oceans-1_41284.pdf https://www.sciencedirect.com/science/article/abs/pii/S0029801815002516 https://www.sciencedirect.com/science/article/abs/pii/S00298... https://library.seg.org/doi/10.1190/geo2018-0090.1 https://library.seg.org/doi/10.1190/geo2018-0090.1 4. Military specific https://www.navysbir.com/n09_1/N091-092.htm https://www.navysbir.com/n09_1/N091-092.htm [Note the comment re the strategic nature of this information.] https://apps.dtic.mil/dtic/tr/fulltext/u2/1012150.pdf https://apps.dtic.mil/dtic/tr/fulltext/u2/1012150.pdf https://slate.com/culture/2013/10/the-hunt-for-red-october-movie-revealed-classified-information-about-u-s-submarines-because-tom-clancy-knew-his-stuff.html https://slate.com/culture/2013/10/the-hunt-for-red-october-m... 5. Even Google has a patent! https://patents.google.com/patent/US5339684A/en https://patents.google.com/patent/US5339684A/en ____ Edit: Just found this very specific reference too, but it's not free: https://pubs.geoscienceworld.org/tle/article-abstract/34/12/1498/136542/How-do-submarines-use-gravity-gradients-to-avoid https://pubs.geoscienceworld.org/tle/article-abstract/34/12/...