Sea distances seem to be just wrong.
In old Mod1914 for HOI2:
Taranto --> Gulf of Taranto 214 km
Venice --> North Adriatic Sea 179 km
San Francisco --> Wake Island 4598 km
San Francisco --> San Francisco Bay 154 km
Wake Island --> Manila 3223 km
Wake Island --> Guam 2236 km
In Mod1914 for DH
Taranto --> Gulf of Taranto 1055 km
Venice --> North Adriatic Sea 938 km
San Francisco --> Wake Island 13861 km
San Francisco --> San Francisco Bay 16 km (not a typo)
Wake Island --> Manila 12269 km
Wake Island --> Guam 9690 km
This makes Spanish-American war impossible to be historical, and also many fleets are just blocked in their harbours and can't even sail to the sea province in front of it because it's already out of range.