- 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.
False Bottom Echoes
- This error happens when the range setting is lesser than the prevalent depth.
- The echo arrives at the E/S after the stylus has completed its one trace run and has begun the next trace.
- This will result in considerable under reading.
Pythagoras Error
