capital_ships = {
    name = DOCTRINE_TRACK_CAPITAL_SHIPS
    background = "GFX_fleet_in_being_bg"
    background_offset = -10
    icon = "GFX_doctrine_milestone_ships_naval"
    icon_frame = "GFX_doctrine_decor_capital_ship_naval"
    mastery = {
        multiplier = 2.0 # TODO - balance this number
        equipment = {
            capital_ship
        }
    }
}

carriers = {
    name = DOCTRINE_TRACK_CARRIERS
    background = "GFX_base_strike_bg"
    background_offset = -40
    icon = "GFX_doctrine_milestone_carriers_naval"
    icon_frame = "GFX_doctrine_decor_carriers_naval"
    mastery = {
        multiplier = 5.0 # TODO - balance this number
        equipment = {
            carrier
        }
    }
}

screens = {
    name = DOCTRINE_TRACK_SCREENS
    background = "GFX_fleet_in_being_bg"
    icon = "GFX_doctrine_milestone_screens_naval"
    icon_frame = "GFX_doctrine_decor_screens_naval"
    mastery = {
        multiplier = 1.0 # TODO - balance this number
        equipment = {
            screen_ship
        }
    }
}

submarines = {
    name = DOCTRINE_TRACK_SUBMARINES
    background = "GFX_trade_interdiction_bg"
    background_offset = -20
    icon = "GFX_doctrine_milestone_submarine_naval"
    icon_frame = "GFX_doctrine_decor_submarines_naval"
    mastery = {
        multiplier = 3.0 # TODO - balance this number
        equipment = {
            submarine
        }
    }
}

#####################################
# Victorian Naval Era Tracks
#####################################

victorian_naval_screens_track = {
    name = DOCTRINE_TRACK_VICTORIAN_NAVAL_SCREENS
    # background = "GFX_victorian_naval_screens_bg"
    # icon = "GFX_doctrine_milestone_naval_screen"
    # icon_frame = "GFX_doctrine_decor_naval"
    mastery = {
        multiplier = 2.0
        sub_units = {
            monitor
            torpedo_boat
            corvette
            frigate
        }
    }
}

victorian_naval_capital_track = {
    name = DOCTRINE_TRACK_VICTORIAN_NAVAL_CAPITAL
    # background = "GFX_victorian_naval_capital_bg"
    # icon = "GFX_doctrine_milestone_naval_capital"
    # icon_frame = "GFX_doctrine_decor_naval"
    mastery = {
        multiplier = 2.0
        sub_units = {
            gunboat
            ironclad
            cruiser
        }
    }
}

victorian_naval_trade_track = {
    name = DOCTRINE_TRACK_VICTORIAN_NAVAL_TRADE
    # background = "GFX_victorian_naval_trade_bg"
    # icon = "GFX_doctrine_milestone_naval_trade"
    # icon_frame = "GFX_doctrine_decor_naval"
    mastery = {
        multiplier = 1.5
        sub_units = {
            corvette
            frigate
            gunboat
        }
    }
}

#####################################
# Machine Age Naval Era Tracks
#####################################

machine_age_naval_battlefleet_track = {
    name = DOCTRINE_TRACK_MACHINE_AGE_NAVAL_BATTLEFLEET
    # background = "GFX_machine_age_naval_battlefleet_bg"
    # icon = "GFX_doctrine_milestone_naval_battleship"
    # icon_frame = "GFX_doctrine_decor_naval"
    mastery = {
        multiplier = 2.0
        sub_units = {
            battleship
            battle_cruiser
            dreadnought
            heavy_cruiser
        }
    }
}

machine_age_naval_screens_track = {
    name = DOCTRINE_TRACK_MACHINE_AGE_NAVAL_SCREENS
    # background = "GFX_machine_age_naval_screens_bg"
    # icon = "GFX_doctrine_milestone_naval_destroyer"
    # icon_frame = "GFX_doctrine_decor_naval"
    mastery = {
        multiplier = 2.0
        sub_units = {
            destroyer
            cruiser
            torpedo_boat
        }
    }
}

machine_age_naval_submarine_track = {
    name = DOCTRINE_TRACK_MACHINE_AGE_NAVAL_SUBMARINE
    # background = "GFX_machine_age_naval_submarine_bg"
    # icon = "GFX_doctrine_milestone_naval_submarine"
    # icon_frame = "GFX_doctrine_decor_naval"
    mastery = {
        multiplier = 2.0
        sub_units = {
            submarine
            coastal_submarine
        }
    }
}

machine_age_naval_carrier_track = {
    name = DOCTRINE_TRACK_MACHINE_AGE_NAVAL_CARRIER
    # background = "GFX_machine_age_naval_carrier_bg"
    # icon = "GFX_doctrine_milestone_naval_carrier"
    # icon_frame = "GFX_doctrine_decor_naval"
    mastery = {
        multiplier = 2.0
        sub_units = {
            carrier
        }
    }
}