Cal­i­brat­ing your echo sounder

Yachting Monthly - - THE KNOWLEDGE - Andy Du Port

An echo sounder cal­i­brated to read depths from the wa­ter­line (the ac­tual depth of wa­ter) is more use­ful than one set to read from be­low the keel. In shal­low coastal wa­ters a skip­per should al­ways know the height of tide and, there­fore, the ex­pected depth of wa­ter. Read­ings from the keel tell you when you’re about to go aground, by which time it is prob­a­bly too late.

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