The nominate subspecies C. a. antarcticus occurs on the Falklands where it is common on many smaller islands but scarce on West and East Falkland where it suffers from predation by introduced cats and rats.
At the time of his disappearance, Addis was part of a five man team that had journeyed to the remote settlement of North Arm in Lafonia on East Falkland, approximately 90 miles (140 km) from the Falklands capital Stanley.
During the 1982 Falklands War, Operation Sutton was the British landings on the shores of San Carlos Water, at Ajax Bay and Port San Carlos, near the San Carlos on East Falkland.
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He took part in the Falklands War leading the landing of 600 Scots Guards and others at Fitzroy on East Falkland.
Volunteer Point is a headland on the east coast of East Falkland, in the Falkland Islands, to the north north east (as the crow flies) of Stanley, and east of Johnson's Harbour and Berkeley Sound.
Captain John Strong of the Welfare made the first recorded landing on either of the main islands (West and East Falkland) on 29 January 1690, at Bold Cove (near Port Howard) just off Falkland Sound.
The Spanish name "Estrecho de San Carlos" refers to the ship San Carlos which visited in 1768; confusingly the English name "San Carlos Water" is a much smaller inlet on East Falkland - and gives its name to San Carlos, Port San Carlos and the San Carlos River.