By 09 : 55 echo ranging ceased and " Nautilus " raised her periscope.
2.
The cruiser and two of the destroyers were now out of range; echo ranging by the third appeared too accurate for comfort.
3.
The first patent for an underwater echo ranging device was filed by English meteorologist Lewis Richardson a month after the sinking of the Titanic.
4.
During that time, VP-47 became the first Extended Echo Ranging ( EER ) qualified patrol squadron and was the first squadron to employ EER tactics in real-world operations.
5.
EA-2 is an AEA flight test aircraft, initially flying on Pax River's Atlantic Test Range ( ATR ) for developmental test of the AEA system before transitioning to the Electronic Combat Range ( ECR, or'Echo Range') in Naval Air Weapons Station China Lake in California.
6.
The Porpoise and Sonar ( 1961 ) project was not only important in finding that porpoises made sounds, but that the findings were seen as having " a bearing on national defense, as a means of improving Navy sonar for echo ranging of the porpoise is superior in many respects to the best that man has yet been able to develop &"
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