Advance
Improved Shipyards
To defend our interests around the globe, we will require a strong Navy. We must ensure our shipyards can produce ships as quickly as possible to replace any losses we may suffer.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Revolutions tree itself.
Modifiers
Definitionin_game/common/advances/4_choices_adm.txt:411
413icon = rudimentary_coastal_ship_repair
414for = adm