Definition
CATZOC is an ENC meta-attribute grading survey quality from A1, the best, through A2, B and C to D, with U for unassessed. Category A1 implies position accuracy of about five metres and depth accuracy of roughly half a metre plus one per cent of depth, with full seafloor search; the lower categories widen these limits sharply and may involve no systematic search for isolated dangers. Poor zones demand greater under-keel clearance.
Want to apply this on the water?
Ask Saily out loud for an example, a scenario or a simpler explanation.
Talk to Saily