Canadian Hydrographic Service - Levels of Service

A relative risk classification for areas delineated by Canadian Hydrographic Service chart limits.


A classification is used to determine a Level of Service for charts and other CHS products and services. The risk levels are defined as High, Medium and Low with the High-risk areas receiving more of our resources and more frequent updates. Many factors are considered in the risk assessments such as the number of accidents in a given area, tanker routes, traffic, infrastructure, navigational complexity, and more.

For more information, please visit the Levels of Service section of the Canadian Hydrographic Services web site.

Access and Constraints

Please review the Canadian Hydrographic Copyright and Licensing website for details.

Layers and Data

This map is composed from the following services. Availability of layers and data is constrained to the supported interfaces available. Please refer to our Web Map Services page to learn more on how to use the supported interfaces.
Service Name Supported Interfaces help