MS Togo was a German merchant ship that was launched in 1938. Requisitioned by Nazi Germany's Kriegsmarine as Schiff 14, in April 1940 she participated in the invasion of Norway; in August 1940 was converted to a minelayer as part of the German plan to invade England; then from June 1941 she began conversion to the armed auxiliary cruiser (Hilfskreuzer) HSK Coronel.

A radar picket is a radar-equipped station, ship, submarine, aircraft, or vehicle used to increase the radar detection range around a nation or military force to protect it from surprise attack, typically air attack, or from criminal activities such as smuggling. By definition a radar picket must be some distance removed from the anticipated targets to be capable of providing early warning. Often several detached radar units would be placed in a ring to encircle a target to provide increased cover in all directions; another approach is to position units to form a barrier line.