In the discussion which followed the papers on Hovercraft Navigation, Captain M. J. Edwards raised an important point. ‘If the hovercraft is the stand-on vessel, it may be impossible for a large slow-moving vessel to take avoiding action in the short period between sighting and collision.’ This implied that both were following the International Collision Regulations, and these cannot be altered (except by local authorities in ‘inland waters’) without international agreement and the attendant delay.