Definition
Withies are informal local marks, traditionally willow saplings, used in shallow creeks and drying harbours where conventional buoyage is uneconomic. Conventions vary by locality and are seldom charted, so a current pilot book or local knowledge is essential. In some East Coast and Dutch waters an upright bushy withy marks one side and an inverted or bound one the other. Positions may shift, and they should never be treated as surveyed marks.
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