The pages listed here are served from sites external to the U.S. National Ice Center.
- Canadian Ice Services
- The Home Page for the Canadian Ice Services
- International Ice Patrol
- The International Ice Patrol site maintained by the United States Coast Guard.
- North American Ice Service
- A combined service involving Canadian Ice Services, the International Ice Patrol, and the National Ice Center.
- International Polar Year
- Site maintained by the International Polar Year organization.