Informasjonen om registrerte krigsseilere er ikke nødvendigvis fullstendig. Eksempelvis vil mønstringer og utmerkelser for enkelte sjøfolk bli registrert senere, ettersom nye kilder blir gjennomgått.
The National Archives, Kew, HS 9/864/3:
"On the outbreak of war he immediately volunteered for service to the [... .] The Lensmann suggested that he should take a job on board the Sheriff's launch in order to release another man who had military training and was liable for service. [...] KRISTOFFERSEN agreed to do this and on the 12.4.40 he began his new duties. [...]
He served on the Sheriff's boat, the "ROLF" until the end of October 1940 when he had to give up his job owing to the restricted use of his official boat by the Sheriff. [...]
KRISTOFFERSEN then decided to go back to Kirkenes to take employment with his uncle as he did not consier that it would be worthwile to commence fishing that autumn. He took employment with his uncle's company and remained there until February 1941 when he returned home."
Flyktet senere til Sverige: "In Stockholm  he was sent to the British Legation where he had a conversation with a man whose name he does not know. He understood from this that he was to be employed on the Shetland boats and welcomed the opportunity."
Shetlandsgjengen. Heltene i Nordsjøen, s. 402:
Innlemmet i Shetlandsgjengen: 25.4.1943, nr. c164.
Antall turer: sesong 1943-44=10, sesong 1944-45=29.
Overført annen virksomhet: 7.12.1945.
Antatt i Marinen: 25. april 1943, som: U.M.M.
Sivil stilling: Fisker og motormann
Militær spesialutdannelse eller kurser: 2 mndr radioskole i London
Dimittert fra Marinen: 2+6. januar 1946.
«Shetlandsgjengen. Heltene i Nordsjøen», Asgeir Ueland, 2017.
"Krigskorset og St. Olavsmedaljen med ekegren", redigert av Erik Gjems-Onstad, Oslo 1995, s. 202.
The National Archives, Kew, HS 9/864/3
Sjøforsvarets londonarkiv ved Marinemuseet i Horten: P.26. Kort 353-354.