Chart 1 Symbols, Abbreviations and Terms Used on Charts

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Depths - Section I

General

Ref. IHO Symbology Description CHS Symbology
1 Existence doubtful
2 Sounding doubtful
3.1 Reported, but not surveyed
3.2 Reported with year of report, but not surveyed
4 Reported, but not confirmed sounding or danger
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