A UK dive boat’s malfunctioning GPS & engine breakdown were the cause of two divers being lost in fog near the wreck of the ship ‘Alster’. Humber Maritime Rescue Coordination Centre was called by a dive vessel at just after 1530 on a recent summer afternoon. They were told that the vessel’s engine and GPS had broken and it couldn’t find the two divers who were believed to be on the surface in black wets suits and marker buoys. The situation was not helped by thick fog that reduced visibility to 50 metres.