You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
Presumably Sturdee sent wireless or cable signals to the Admiralty that he'd arrived at Port Stanley. Let's have a spy in Britain inform Germany of this, with Von Spee receiving accurate warnings.
1 November 1914 - Battle of Coronel
3 November - Von Spee's force enters Valparaiso harbour to a welcome by the German population
11 November - Admiral Sturdee with Invincible and Inflexible leaves Devonport for the Falklands
26 November - Sturdee arrives at the Abrolhos Archipelago off Brazil. Sturdee announced his intention to depart for the Falkland Islands on 29 November.
28 November - Sturdee departs for the Falklands a day earlier than planned
7 December - Sturdee's force arrives at Port Stanley
8 December - Battle of Falklands
Now some POD and espionage, per Wikipedia:
"Although secrecy of the mission was considered important so as to surprise Spee, Lieutenant Hirst from Glasgow heard locals discussing the forthcoming arrival of the ships while ashore at Cape Verde on 17 November; however the news did not reach Spee."
"It was generally believed Spee was misled by the German admiralty into attacking the Falklands, a Royal Naval fuelling base, after receiving intelligence from the German wireless station at Valparaiso which reported the port free of Royal Navy warships. Despite the objection of three of his ships' captains, Spee proceeded to attack."
However, in 1925 a German naval officer, Franz von Rintelen, interviewed Admiral William Reginald Hall, Director of the Admiraltry's Naval Intelligence Division (NID), and was informed that Spee's squadron had been lured towards the British battlecruisers by means of a fake signal sent in a German naval code broken by British cryptographers.[21] (Similarly, on 14 March 1915, Dresden was intercepted by British ships while taking on coal at sea in a location identified by NID codebreakers).
Here's our POD: Von Spee has good and accurate intel from German spies. So, Von Spee, now sitting in Chile knows that Sturdee has sailed on 11 Nov, and that he's off Brazil 26 Nov, and that he plans to depart on 29 Nov. What does Von Spee do? Once he sails what other intel can he expect to receive? Perhaps IJN movements via the British Admiralty spies.