Observe and identify
Foundation level, about 3 min. Chart reading.
The situation
A wreck glyph on this fictional chart has a dotted surround. No surveyed debris boundary or universal passing distance has been supplied.
What does that dotted surround establish?
- A potentially dangerous wreck; establish extent and clearance from further information
- A measured safe-passing boundary
- Safe water immediately outside the dots
Answers and explanations
Lookout: Chart-symbol geometry conveys meaning; its printed size is not a measured exclusion radius.
The sound answer
A potentially dangerous wreck; establish extent and clearance from further information
The surround identifies the hazard symbolically. Depth, chart scale, survey information, water level and the vessel determine the passage assessment.
Why the other options fall short
A measured safe-passing boundary
The dotted printed surround is not a surveyed safety boundary.
Safe water immediately outside the dots
The glyph does not guarantee that debris or shallow water ends at its printed boundary.
Chart 1 · K 28, dangerous wreck
A dangerous-wreck glyph identifies a hazard. Its dotted surround is symbolic; determine safe clearance from the full chart and current information.