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.

Notice on Sainte-Anne-De-Bellevue (#16005) and Pointe-Claire (#15330) - posted on: 2020-03-23

Please note that the CHS tides database can no longer manage the data received from Environment and Climate Change Canada (ECCC) for the following stations: Sainte-Anne-De-Bellevue (#16005) and Pointe-Claire (#15330). We are currently building a new system that will support these stations which will be available later this year.

Notice on Holyrood (00925) station 2020 data - posted on: 2020-02-12

An issue was discovered in the calculations for Holyrood (00925) station 2020 data. Corrections have been applied and the WDS has been updated. If you have acquired data from the WDS service for Holyrood (00925) station prior to Tuesday February 11th 2020, please be advised you must re-download the data starting Dec 14th 2019 and onward through 2020.

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

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.

Explanatory Note Regarding the Practice of CHS on the Communication of Hazards to Navigation - posted on: 2013/11/25

CHS may receive new information pertaining to navigation from various sources. All information is assessed to evaluate its quality and determine if it is a potential hazard to navigation.

The practice of CHS is to issue a "Reported Danger" chart correction, in accordance with Specification B-424.5 of the Regulations for International (INT) Charts and Chart Specifications of the IHO (S-4). This means charting the potential hazard accompanied by the word "Rep" followed by the date of the report between brackets. This correction is also issued through Notices to Mariners ("NOTMAR").

In addition, CHS ensures that this information is communicated as soon as possible to mariners by the means of Notices to Shipping ("NOTSHIP"), first broadcasted by the Marine Communications and Traffic Service of the Canadian Coast Guard and then made available on the following internet address:

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