The main purpose of the paper is familiarization with the matter of most crucial aspects of the minimum under keel reserve for the sea-going ships navigating on the restricted tidal waters. For the purpose of this paper, river Humber was used as good example of high tidal range in conjunction with variety weather conditions encountering in this area affecting the tides. The Author made use of his research and job experi-ence as the pilot, closely co-operating with other authorities, e.g. Vessel Traffic Service ( VTS ) Humber, lo-cal Hydrographic Department as well as Maritime Coastguard Agency ( MCA ) and Maritime Accident In-vestigation Bureau ( MAIB ). The extensive statistics of groundings and near miss situations, in connection with in-depth analysis will be due to presented with conclusions and proposals of sorting out some problems. The new concept of Dynamic Under Keel Clearance DUKC® software with the trials assessments will be widely put forward in compare with currently utilizing tools and software by VTS and Ships’ Traffic Centre.