Beesley, Paul; Roscoe, Spud (5 Nisan 2008). "Distress communications". Jerry Proc. Radio communications and signals intelligence in the Canadian Navy. 27 Şubat 2005 tarihinde kaynağından arşivlendi. Erişim tarihi: 27 Şubat 2022. – Mostly historical information for dates prior to February 2009.
Beesley, Paul; Roscoe, Spud (5 Nisan 2008). "Distress communications". Jerry Proc. Radio communications and signals intelligence in the Canadian Navy. 27 Şubat 2005 tarihinde kaynağından arşivlendi. Erişim tarihi: 27 Şubat 2022. – Mostly historical information for dates prior to February 2009.
