[EchoAbstract]

FYI, tracking items on water with a land (or sea) based radar is very difficult due to atmospheric effects (mainly ducting) and can cause unacceptable levels of false detections. Combine this with the lack of computer processing at the time means that you have a human operator trying to determine from a scope which targets to attack. I think that this makes detecting and tracking u-boats with early radar very unlikely. If you ever make it to Pearl Harbor on Oahu you can see some examples of the radar scope technology from the Pearl Harbor attacks, it was not very easy to use.