Found this:
John High, built by A. Hall & Co. Ltd., Aberdeen in 1916 and operated at the time of her loss by Royal Navy, was a British navy trawler of 228 tons.
On August 7th, 1916, John High was sunk by a mine from the German submarine U-75 (Curt Beitzen), off Mt. Sozonova, Murman coast. 14 persons were lost.
Seaman JOHN SMITH
Last address in Lewis: 48 Lower Garrabost,
Son of John and Marion Campbell Smith, of 22, South Bragar, Stornoway; husband of Christina Smith, of 48, Lower Garrabost, Stornoway.
Service unit: Royal Naval Reserve, HMT John High
Service number: 1963/SD
Date of death: 6 August 1916 at the age of 47
Ship sunk by U-boat in the White Sea
Memorial: Chatham Naval Memorial, panel 19
Local memorial: Point (Garrabost)