Inspired by the Luftwaffe thread. Germany have historically been a land power, and were only powerful at sea for a brief decade in the early 20th Century. Their performance in WW2 was poor, in part due to the fact that Hitler concentrated on the Heer and the LW. Their major surface combatants were the Bismarck and Scharnost-class battleships, the Deutschland-class pre-Dreadnoughts, the Deutschland and Admiral Hipper-class Heavy Cruisers/Panzerschiffe and the Emden, Konigsberg and Leipzig-class Light Cruisers. They also had 30 destroyers and plenty of smaller craft. They are most famous for their U-Boats, which were revolutionary and the only successful branch of the KM.
Hitler ordered the Plan Z naval construction plan in 1939. It projected a navy of 10 battleships, 3 battlecruisers, 4 Aircraft Carriers, 15 Panzerschiffe, 5 Heavy Cruisers, 13 Light Cruisers, 22 Scout ships, 68 Destroyers and 90 Torpedo Boats. While this would be no Royal, Imperial Japanese or US Navy, it would undoubtedly be the 4th best navy in the world.
Now, this plan isn't really what the KM needs so what would be the best POD to get the strongest possible Kriegsmarine in 1940?