Canadian Chart 1 Symbols, Abbreviations and Terms

Rocks, Wrecks, Obstructions - Section K

Ref.	IHO Symbology	Description	CHS Symbology
20		Wreck, hull always dry, on largescale charts
21		Wreck, covers and uncovers, on largescale charts
22		Submerged wreck, depth known, on largescale charts
23		Submerged wreck, depth unknown, on largescale charts
24		Wreck showing any portion of hull or superstructure at level of chart datum
25		Wreck of which only the mast or masts are visible at chart datum
26		Wreck, least depth known by sounding only
27		Wreck, least depth known, swept by wire drag or diver
28		Wreck, least depth unknown, considered to be potentially dangerous to some surface vessels Caution: Not all wrecks which are potentially dangerous have this symbol, see caution at K 29
29		Wreck, least depth unknown Caution: On many charts, this symbol is used for wrecks of unknown least depth, but considered to be covered by more than 20m of water. The wrecks thus represented are then potentially dangerous to vessels with a draught greater than 20m. Note: This symbol is also used for all wrecks in water over 200m deep.
30		Wreck, least depth unknown, but considered to have a safe clearance to depth shown
31 & 31.2		Remains of a wreck or other foul ground, non dangerous to navigation but to be avoided by vessels anchoring, trawling etc. CAUTION: On some CHS charts, this symbol may represent a foul area dangerous to surface navigation