- Front page
- About HELCOM
- Vacancies
- Contact us
- The Helsinki Convention
- Ministerial Declarations
- Ministerial Meeting 2013
- Recommendations
- Baltic Sea Action Plan
- Groups
- Projects
- Publications
- Press office
- Meetings and Documents
- Manuals and guidelines
- Assessments and indicators
- Shipping
- The marine environment
- Data and maps
-
Hydrography sampling frequency
