The file consists of correspondence, sent (and received) by the Engineer to the Humber Conservancy Board (Arthur Ernest Butterfield), to/from various map and chart suppliers, and various shipping companies and their brokers regarding the implementation of 'Rules and Regulations for Shipping. This includes the implementation of Double Summer Time and British Summer Time; the locations of Safe Anchorages within the Humber for oil tankers, trawlers and other vessels; the supply of maps and charts of the Humber to shipping organisations and others.

Also included in the file is correspondence with the Hull Steam Trawlers Mutual Insurance and Protection Company connected with the installation of a hut and flagstaff near the old Low Killingholme Lighthouse for the purpose of fitting semaphone equipment for providing anchorage information to trawlers; the purpose of the information being to reduce congestion in Hull Roads. In addition, it also includes correspondence with Associated Humber Lines on the subject of congestion in the Hull Roads, opposite the Riverside Quay, along with correspondence concerning vessels violating shipping rules and regulations.