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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