Environmental monitoring should provide information that allows assessing the environmental status of the marine environment, calculating the path to be taken and the progress already made to achieve good environmental status and identifying the corrective measures to be taken that lead to the recovery of that state, when it is changed.
Monitoring, as a process of systematic assessment of the environmental status of marine waters, is an essential tool for increasing scientific knowledge of marine ecosystems and the impact of human activities on the marine environment.
DGRM is responsible for ensuring the permanent updating of data related to the monitoring of the marine environment.

In 2014, Portugal under the Marine Strategy Framework Directive (Directive 2008/56 / EC of the European Parliament and of the Council, of 17 June, amended by Commission Directive (EU) 2017/845, of 17 May, MSFD) delivered to the European Commission the Monitoring Programme and the Programme of Measures for the national marine waters uniting in one document the two programs for the four national marine subdivisions, Continent Subdivision, Madeira Subdivision, Azores Subdivision and Extended Continental Shelf Subdivision.
The monitoring established in this scope must be compatible within the marine regions or sub-regions, national marine waters are included in the sub-regions of the Bay of Biscay, Iberian Coast and Macaronesia, and should be based whenever possible on the standards developed within the scope of the OSPAR Convention, and should also consider the contribution of the other legal instruments and international agreements with interference in the marine environment, such as the Water Framework Directive (Directive 2000/60/EC of the European Parliament and of the Council, of 23 October), the Birds Directive (Council Directive 79/409/EEC, 2 April), the Habitat Directive (Council Directive 92/43/EEC, 21 May), as well as regulations under the Common Fisheries Policy.
DGRM is responsible for coordinating the application of the MSFD at the national level, with the Portuguese Institute for the Sea and the Atmosphere, I.P. (IPMA) being responsible for the scientific and technical coordination of the monitoring programmes and programmes of measures. The coordination of the application of the MSFD at the level of the Autonomous Regions of the Azores and Madeira is the responsibility of the respective regional public administration authorities with competences in the environmental and sea matters.
Continental shelf ecosystems: sampling methods (see here)
Deep sea: sampling methods in abyssal areas (see here)