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- Mate (Oceans or Near Coastal (Uninspected Fishing Industry Vessel)) »
- Q190 - Navigation General: Near Coastal
227. When using an echo sounder in deep water, it is NOT unusual to encounter which situation?
A strong echo from a deep scattering layer is typically observed at a depth of approximately 200 fathoms during the day and closer to the surface at night due to diel vertical migration.
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