Announcements and important messages

Find announcements and important messages concerning the nautical charts and services section of our website. This includes scheduled maintenance, reported issues with tide and current tables, and changes to how nautical information is communicated.

Information technology infrastructure maintenance – January 23, 2020, 9:00 A.M. – January 27, 2020, 9:00 A.M. (ET) - posted on: 01/23/2020

We’ll be doing maintenance on the website from January 23, 2020, 9:00 A.M. – January 27, 2020, 9:00 A.M. (ET). During this period, there may be service interruptions to the and the websites.

CHS waterlevel observations web service maintenance - posted on: 12/19/2019

The CHS waterlevel observations web service has been experiencing difficulties and had to be taken down for repairs. It is expected to return to operation in a couple of days. We apologize for any inconvenience.

Notice for users of the WDS tidal prediction data service - posted on: 12/05/2019

Users of the WDS tidal prediction data service: A problem developed with water level prediction data on the WDS service following loading of new 2020 data, which commenced on Nov 10, 2019. If you have acquired data from the WDS service on or prior to Thursday Dec 5th 2019, please be advised you must re-download all tidal predictions starting Dec 14th 2019 and onward through 2020.

Advance Notice concerning Certification Requirements - posted on: 02/13/2019

Be advised that effective 1 April 2022, suppliers of hydrographic services to the Government of Canada pursuant to a Hydrographic Services Supply Arrangement will be required to employ either a Certified Hydrographer (CH) or Certified Hydrographic Technician (CHTech), or an alternate certification providing it receives mutual recognition with the Association of Canada Lands Surveyors (ACLS). The ACLS provides the pathway in Canada for certification of hydrographic and offshore surveyors to international standards. By this notice, the certified employee shall be required to participate directly in the provision of the contracted services. The certification process is open to anyone with appropriate training and experience. The CH or CHTech need not hold a Canada Lands Surveyor Commission. Details concerning how a candidate may achieve certification are provided in the Candidate Handbook on the ACLS website at

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