Enemy ships fire their AA missiles from almost 5km away, there is no reliable way of visual identification without putting the planes at risk. Radar should datalink range and target identity to friendly vehicles and the viewing scope so we can see the ships outlined on the HUD and know how far they are at all times when closing in on them from 5km+ away. This is a better range estimation for pilots than "Oh, look! The enemy fired a missile, I must be closer than 5km!"