Echoes multiple
Echoes multiple in echo sounding, any of the echoes received subsequent to the first one and due to a multiplicity of reflections back and forth between the bottom and surface these reflections often register on the dial of a usual indicator, or on the fathogram of a graphic recorder, at multiplies of the true depth such echoes are sometimes mistaken for the first
Source: http://www.iho.int/iho_pubs/standard/S-32/S-32-eng.pdf
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