Fleet Defense Idea ID
The add_ideas ID for Fleet Defense in Hearts of Iron IV is fleet_defense_navy_spirit.
Fleet Defense

naval_command_spirit
Add this idea with the add_ideas command and the idea ID fleet_defense_navy_spirit.
Effects
While active, Fleet Defense applies the following modifiers in Hearts of Iron IV:
- Screening Efficiency+10%
- Fighter Sortie Efficiency+10%
About this idea
Combat air patrol and light ships exist to allow our heavy hitters to do their jobs without being rudely interrupted.