sentences:  "Venturer" had only eight torpedoes as opposed to the 22 carried by "U-864".After three hours Launders decided to make a prediction of "U-864"s zig-zag, and released a spread of his torpedoes into its predicted course.This manual computation of a firing solution against a three-dimensionally manoeuvring target was the first occasion on which techniques were used and became the basis of modern computer-based torpedo targeting systems.