 To confuse the human observers, ships often used dazzle camouflage, which consisted of painting lines on a ship in an effort to make determining a target's angle on the bow difficult.While dazzle camouflage was useful against some types of optical rangefinders, this approach was useless against radar and it fell out of favor during World War II.The prediction of the target ship's position at the time of projectile impact is critical because that is the position at which the own ship's guns must be directed.