This document is the Deliverable “D3.1. Best practices guidelines on sensor calibration for underwater noise monitoring in the Mediterranean Sea” of the QUIETMED project funded by the DG Environment of the European Commission within the call “DG ENV/MSFD Second Cycle/2016”. The QUIETMED project aims to enhance cooperation among Member States (MS) in the Mediterranean Sea to implement the Second Cycle of the Marine Directive and in particular to assist them in the preparation of their MSFD reports by 2018 through: i) promoting a common approach at Mediterranean level to update GES and Environmental targets related to Descriptor 11 in each MS marine strategies ii) development of methodological aspects for the implementation of ambient noise monitoring programs (indicator 11.2.1) iii) development of a joint monitoring programme of impulsive noise (Indicator 11.1.1) based on a common register, including gathering and processing of available data on underwater noise. This public document presents a review and comparison of the national implementations. It is based upon the in-depth assessment of national reports on good environmental status, environmental targets and monitoring programmes. It relies also on the update by the project partners of the work conducted so far at national levels.

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