Each CH station had slightly different calibration, the ROC's Post Instrument often produced different results, and all of the reports took time to flow back to the central plotting rooms and then out to the fighters. These effects meant that the information reaching the fighter controllers was always slightly inaccurate and a few minutes out of date. The system, as a whole, had an inherent accuracy of about . This was fine for daytime interceptions, but at night, when the pilot's eyesight was limited to perhaps , there was no way to guide the fighters to their targets close enough that they would be seen.
