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- Master & Chief Mate (Oceans or Near Coastal (Offshore Supply Vessel)) »
- Q204 - Navigation General: Oceans
201. If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated?
The fathometer's two-second signal return time indicates a depth calculated using the formula Depth = (speed of sound x time) / 2. Given a standard speed of sound in seawater, this yields a depth of approximately 824 fathoms, making option D the correct answer.
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