For the inland waters of Europe there are some special regulations in force. Vessels over 20m in length should have an Inland AIS and an inland ECDIS. (Since jan 2017 compulsory in Germany, rest of europe to follow). OpenCPN from version 4.6 and higher has a special mode to comply with the rules for inland ECDIS version 2.3 in information mode.
Under 'Options' > 'User Interface' there is a checkbox 'Use settings for Inland ECDIS'. When checked OpenCPN will:
Remember that you only comply with regulations if OpenCPN is in inlandECDIS mode, using the most recent inland ENC charts, no other programs are running on the computer and the computer screen is readable from the cunning position.