About tides, currents, and water levels

Learn about tides and currents in Canada and the history of tidal measurements.

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Services and information

Tides and currents in Canada

About tides and currents, including their causes and how we use their data.

Notices and important messages

Notices on digital services and water level gauges.



List of tidal terms and expressions, and acronym meanings.


Vertical datum chart references

About the vertical datum reference on navigational charts.


Tidal phenomena

Tides and tidal streams, shallow water effects and non-tidal influences.

History of tidal measurements

Background on tidal, current and water level surveying.


What we are doing


CHS Digital Transformation Initiative

CHS Digital Transformation Initiative

At the Canadian Hydrographic Service, innovation is a guiding principle for the bold digital transformation initiative now underway.

Supporting women in hydrography

Supporting women in hydrography

Enabling more women to participate equitably and assume more leadership roles in the field of hydrography.

2022 Tide Tables Available Now

2022 Tide Tables Available Now

Download your 2022 Canadian Tide and Current Tables now to help navigate safely through Canadian waters.