Notices and important messages
Find important messages, including information technology infrastructure maintenance.
2023/08/09 - Notice on Dynamic Vertical Clearance Forecasts
Dynamic vertical clearance forecasts (dvcf-spine1) have been restored. They are currently available via the API and the mobile application. They should be available on the website within a few days.
2023/06/27 - Notice on Port Stanley (12400)
Port Stanley is non-operational and requires on-site maintenance. This status will remain for approximately two weeks and data will be unavailable from 2023/06/08 until maintenance is complete.
2023/06/15 - Notice on Summerstown (14940)
Summerstown station is non-operational due to on-site maintenance and repairs. The Maintenance status will remain for approximately two weeks and data will be unavailable during this time.
2023/06/07 - Notice on Ontario, Prairie, and Arctic region Water Level stations
The following stations in the Ontario and Prairie region of CHS are temporarily offline as of 2023-06-06 18:33 UTC due to communications issues. The outage is currently being investigated. Thank you for your patience.
2022/11/04 - Predictions, heights and datums updates
The predictions, heights and datums have been updated for the following stations to match chart datum on our existing products; effective November 11, 2022: Cape Blomidon (#00290), Arichat (#00580), Petite de Grat (#00582), St Peters Bay (#00587), Lewisporte (#01070), Port Hood (#01560) and Red Bay (#02600).
2022/10/13 - Notice on Port aux Basque, NL (00665)
Following the storm Fiona, the Canadian Hydrographic Service is currently experiencing problems with the water level observations at Port aux Basque, NL (00665). The prediction data is still available.
2022/10/12 - Notice on Nain, Labrador (01430)
Please note that Nain, Labrador (#01430) tide gauge will be undergoing maintenance for an extended period of time. Observation and forecast data will be unavailable during this time. Prediction data will still be available.
2022/08/05 - CHS NON-NAvigational (NONNA) Bathymetric Data Update and Release
Client suggested enhancements have been implemented to the CHS NONNA Data Portal including migration to chart datum and enhanced tools for selecting and downloading large geographic areas.
2022/05/19 - Notice on Mahone Bay area stations
Please note that the Predictions, Heights, and Datums have been updated for the following stations to match chart datum on our existing products; effective May 18, 2022: Lunenburg (#00455), Chester (#00465), Owls Head (#00473), Mill Cove (#00475), Blandford (#00479), Hubbards (#00480), Indian Harbour (#00484), Cliff Cove (#00485), Sambro Harbour (#00488).
2022/05/04 - Notice on Bar Point (12005)
Please note that station Bar Point (12005) is offline. Maintenance is required to bring it back into operation. No data will be available during this time. We apologize for any inconvenience.
2022/04/21 - Phase 1 of the discontinuation of digital Raster Navigational Charts (RNC) has begun
Following the preliminary notice published in Notices to Mariners (Edition No. 06/2021, June 25, 2021) and following the consultation period, the Canadian Hydrographic Service (CHS) has begun the discontinuation, in progressive phases, of its digital Raster Navigational Charts (RNC) offered in BSB format.
2022/03/28 - Notice on Saint John, NB (00065)
Please note that Saint John, NB (#00065) tide gauge will be undergoing maintenance for an extended period of time. The estimated completion date is April 30. Observation and forecast data will be unavailable during this time. Prediction data will still be available.
2022/01/05 - CHS Nautical Publications: Free and always up-to-date digital downloads - Printing to be Discontinued
All of the Canadian Hydrographic Service’s nautical publications are now available as free digital downloads. Providing free digital nautical publications means easier access to up-to-date information for safer navigation. The Canadian Hydrographic Service will permanently discontinue the printing of all volumes listed below effective March 1st, 2022.
2022/01/04 - Sailing Directions: Updates to be included directly in the publication for easy reference
Sailing Directions are updated throughout the year to help ensure safe navigation. The process to communicate these changes to mariners will be amended as follows starting January 2022.
2021/11/18 - The Web Data Services for both observations and predictions are no longer available through the tides.gc.ca website
Effective May 3rd, 2021: The Web Data Services for both observations and predictions are no longer available through this site and are now accessible through a Canadian Hydrographic Service API at: https://api-iwls.dfo-mpo.gc.ca/swagger-ui.html using Microsoft Edge or Google Chrome.
2021/10/13 - Notice of name change
Please take note that the names have changed for the following Canadian Hydrographic Service tidal stations from Volume 4 - Arctic and Hudson Bay: 1) Hall Beach (5275) is now Sanirajak, 2) Cape Dorset (4245) is now Kinngait.
2021/07/19 - Moving towards Electronic Navigational Charts for safer navigation
To better align with international standards and best practices, the Canadian Hydrographic Service (CHS) will be phasing out Raster Navigational Charts (RNCs) to offer safer Electronic Navigational Charts (ENCs) products and services.
2021/05/04 - Web services and Rest-API
As of 12:00 pm EDT on Monday, May 3rd, 2021, the old Canadian Hydrographic Service WDS services (observations and predictions) have been decommissioned. Please refer to the web services page for information on using the new REST-API for direct access to official water level data and other available services.
2020/09/30 - Canadian Tide and Current Tables – Chart 1 – printing to be discontinued
The Canadian Hydrographic Service has just announced printing to be discontinued for the Canadian Tide and Current Tables and Chart #1 in the September monthly edition of the Notices to Mariners referring mariners to the pdf versions available online. This decision is related to the transformation plan being put forward at CHS to better meet digital product needs.
2020/03/23 - Notice on Sainte-Anne-De-Bellevue (#16005) and Pointe-Claire (#15330)
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.
2020/02/12 - Notice on Holyrood (00925) station 2020 data
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.
2019/12/05 - Notice for users of the WDS tidal prediction data service
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.