Fairway within fairway
From BAWiki
Definition
Refers to a test version for adaptation to climatic changes, during which, within the current fairway, on smaller width, a greater depth is maintained. Ships that unload to today's lows can continue to use the existing larger widths. Ships with a lesser width claim can unload deeper.
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Source
Glossar für das Forschungsprogramm KLIWAS, Mehling, Andrea et al., Bundesanstalt für Gewässerkunde, Koblenz 2011