- In shallow water, the sound energy received at the ship after it is reflected from the sea bottom, may get re-reflected from, reach the sea bottom and get re-re-reflected and mark an echo second time over at twice the depth.
- Or may even an echo third time over at thrice the depth.
- The first echo shows the correct depth. The second and third echoes can be clearly discerned as they grow progressively weaker.
- Something akin to the multiple echoes in Radar.
- Remedy Operate at a scale close to the prevalent depth.
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