In the fall of 1984, somewhere in the Caribbean Sea, Daniel Jeremiah and his brother roamed the top deck of a cruise ship, searching for a working signal. David Jeremiah, a pastor from El Cajon, Calif., had given his sons a portable radio and a task: While he spoke in front of the ship’s passengers, they were to track the fate of their local ballclub. At the same time, thousands of miles to the west, two family friends — Josh Cox and his father — were sitting near first base at Jack Murphy Stadium as Padres first baseman Steve Garvey stepped to the plate. Chicago Cubs reliever Lee Smith peered in from the mound, looking to preserve a ninth-inning tie. On a 1-0 count, Garvey socked a two-run homer to right field, ending Game 4 of the National League Championship Series, extending the Padres’ first postseason and delivering what many still consider the franchise’s greatest moment.