Missile to-hit chances in the ship design display don't seem to be taking Active Terminal Guidance into account for their hit chances.
Ship from my current game (just started in v2.5):
Albuquerque class Destroyer 8,000 tons 210 Crew 1,027.5 BP TCS 160 TH 720 EM 0
4500 km/s Armour 5-35 Shields 0-0 HTK 63 Sensors 5/6/0/0 DCR 2-2 PPV 38.4
Maint Life 2.24 Years MSP 660 AFR 256% IFR 3.6% 1YR 177 5YR 2,654 Max Repair 180.00 MSP
Magazine 168 / 0 Cryogenic Berths 200
Commander Control Rating 2 BRG AUX
Intended Deployment Time: 12 months Morale Check Required
N1/1200 Ion Drive (2) Power 720.0 Fuel Use 81.46% Signature 360.00 Explosion 12%
Fuel Capacity 741,500 Litres Range 20.5 billion km (52 days at full power)
150mm Mk.I Railgun (4x4) Range 60,000km TS: 4,500 km/s Power 9-3 RM 20,000 km ROF 15
FN/SAG-5 Fire Control System (1) Max Range: 128,000 km TS: 4,500 km/s ECCM-0 92 84 77 69 61 53 45 38 30 22
P6/58 Magnetic Mirror Fusion Reactor (2) Total Power Output 12.3 Exp 5%
Mk.II Missile Launch System (6) Missile Size: 8 Rate of Fire 3395
FN/SPG-7 Missile Fire Control (1) Range 33.6m km Resolution 20
Mk.I "Broadsword" Standard Missile (21) Speed: 21,250 km/s End: 15.6m Range: 19.8m km WH: 4 Size: 8 TH: 70/42/21
FN/SPS-8 Radar Array (1) GPS 700 Range 22.2m km Resolution 20
FN/SQN-3 Thermal Sensor (1) Sensitivity 5.0 Detect Sig Strength 1000: 17.7m km
FN/SDN-2 EM Sensor (1) Sensitivity 6.0 Detect Sig Strength 1000: 19.4m km
Missile to hit chances are vs targets moving at 3000 km/s, 5000 km/s and 10,000 km/s
This design is classed as a Military Vessel for maintenance purposes
This design is classed as a Warship for auto-assignment purposes
Missile from above design in missile design screen:
Missile Size: 8.000 MSP (20.0000 Tons) Warhead: 4 Radiation Damage: 4
Speed: 21,250 km/s Fuel: 1,010 Flight Time: 16 minutes Range: 19.84m km
Active Sensor Strength: 0.12 EM Sensitivity Modifier: 6
Resolution: 20 Maximum Range vs 1000 ton object (or larger): 1,299,474 km
Decoys: 2 ECM-1 ATG: 15%
Cost Per Missile: 7.592 Development Cost: 435
Chance to Hit: 1k km/s 244.4% 3k km/s 81.5% 5k km/s 48.9% 10k km/s 24.4%
Replacing the 15% ATG in the missile design with the same MSP of fuel gives the 70/42/21 to-hit chances shown in the ship display.
SJW: Fixed for v2.5.1