Canadian Chart 1 Symbols, Abbreviations and Terms

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Tides, Currents - Section H

Terms Relating to Tidal Levels

Ref.	IHO Symbology	Description	CHS Symbology
1		Chart Datum, Datum for sounding reduction
2		Lowest Astronomical Tide
3		Highest Astronomical Tide
4		Mean Low Water
5		Mean High Water
6		Mean Sea Level
8		Mean Low Water Springs
9		Mean High Water Springs
10		Mean Low Water Neaps
11		Mean High Water Neaps
12		Mean Lower Low Water
13		Mean Higher High Water
14		Mean Higher Low Water
15		Mean Lower High Water
16		Spring tide
17		Neap tide