I just updated the Marinefunknamenliste M.Dv.Nr.82/1 to fix a number of errors I discovered and to add out trigraphs to a theoretical max of 4800 U-boat numbers. There were over 4700. It has been uploaded to the Dropbox site. The original document had a serial number of 1951 in the upper right hand corner, the revised version has a serial of 2018. If you are using this for your boat ID, please check the new book as your trigraph may have changed.