Canadian Chart 1 Symbols, Abbreviations and Terms
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Nature of the Seabed - Section J
SNS a-e
Types of Seabed
| Ref. | IHO Symbology | Description | CHS Symbology |
| 1 |  |
Sand |  |
| 2 |  |
Mud |  |
| 3 |  |
Clay |  |
| 4 |  |
Silt |  |
| 5 |  |
Stones |  |
| 6 |  |
Gravel |  |
| 7 |  |
Pebbles |  |
| 8 |  |
Cobbles |  |
| 9.1 |  |
Rock, Rocky |  |
| 9.2 |  |
Boulders |  |
| 10 |  |
Coral and Coralline algae |  |
| 11 |  |
Shells (skeletal remains) |  |
| 12.1 |  |
Two layers, e.g. sand over mud | |
| 12.2 |  |
Mixed qualities, e.g. fine sand with mud and shells |  |
| 13.1 |  |
Weed (including kelp) |  |
| 13.2 |  |
Kelp, weed |  |
| 13.3 |  |
Seagrass (where distinguished from weed) |  |
| 14 |  |
Sandwaves |  |
| 15 |  |
Spring in seabed | |
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