The campaign research tree includes boiler efficiency, electromagnetic minesweeping, upgraded mines, maneuver warfare, screen tracks, screen formations, and rangefinders. The listed 1928 date for electromagnetic minesweeping is questioned, with a tentative recollection that it should be earlier. The hoped-for rangefinder research leads toward radar. A later review returns to mines and formation-control research before seeking the radar upgrade again. These are game research choices, and the chronology question remains unresolved.
Notable Point · 1:50:21-2:13:21
Research links mines, screens, and fire control
Two campaign research checks connect electromagnetic minesweeping, upgraded mines, formation control, rangefinding, and radar development.