How range-only radar could transform naval fire control

Radio-assisted range finding differs from later radar systems that also detect and track targets. A continuously reliable range would give a fire-control team one of its hardest inputs without depending entirely on optical estimates. The rate at which that range changed could then help infer the target's course and speed while the ship's own motion remained known. In a First World War setting, that limited capability would still be transformative beside mental arithmetic and paper calculations, although shell flight time and the target's momentum would continue to matter.