Coastguards have issued an appeal to vessels in the North Sea which may have sighted the yacht of a missing sailor to get in touch.
The last time the 69-year-old from North Yorkshire made contact with his family was by phone on July 4.
He was last seen in his 17ft yacht Equinox in the Kiel Canal in Brunsbuttel, Germany, and is said to have been planning his return to the UK.
French, Belgian and Dutch coastguards have also been put on alert, and police have logged a missing person’s alert with Interpol too.
Humber Coastguard has been carrying out an air and sea search for the yachtsman since Thursday after being contacted by his family.
Rescuers said in a statement: “Humber Coastguard request any vessel who believes they may have sighted the yacht to urgently contact any coastguard station with information.”