1. The echo sounding was introduced in the 1930s to determine water depth. 2. Her navigation equipment included wireless direction finding and an echo sounding device. 3. By 1933 she carried wireless direction finding and echo sounding equipment. 4. Her navigation equipment included wireless direction finding, an echo sounding device and a gyrocompass. 5. Her navigation equipment included wireless direction finding, and echo sounding device and a gyrocompass. 6. In modern times, echo sounding is used for measuring the seabed in the open sea. 7. His second collection of poems " Echo Soundings " was published by Shoestring Press in 2012. 8. Despite many difficulties, testing of both echo sounding and radio acoustic ranging wrapped up successfully in November 1923. 9. Both echo sounding and radio acoustic ranging required a precise understanding of the speed of sound through water. 10. The term lives on in today's world in echo sounding , the technique of using sonar to measure depth.
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