Port State Control activities must be co-ordinated internationally. Therefore most port States have signed regional Memorandum of Understanding, covering most of the earth′s navigable waters; they are:
MOUs have defined principles for their inspections. Under the Paris MOU the following items related to ECIDS systems on board are inspected:
The selection of paper charts is the responsibility of the Master. It is required that the voyage can be finished safely if the ECDIS system suffers a total system malfunction.
Paris MOU has recommended chart scales which was adopted by other MOU: