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Canadian Chart 1 Symbols, Abbreviations and Terms

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Depths - Section I

Depths in Fairways and Areas

Ref. IHO Symbology Description CHS Symbology
20 Limit of dredged area
21 Dredged channel or area with minimum depth regularly maintained
22 Dredged channel or area with minimum depth not regularly maintained and year of latest survey
24 Depth at chart datum, to which an area has been swept by wire drag. The latest date of sweeping may be shown in parentheses
25 Unsurveyed or inadequately surveyed area; area with inadequate depth information
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