Red section, having started in the 12 o'clock position, started broadcasting immediately when the system was activated. When it stopped 14 seconds later, yellow section's clock was now reaching the 12 o'clock position and began to broadcast, and so forth. Over a one-minute period, all four sections (if present) squeaked and could be located. A separate radio control switch stopped the radio signal from broadcasting while the clock continued to move. This allowed the pilot to set up the system early in the flight, and then turn it off when better communications were needed, like in combat. The system could then be turned on again at any time, with the clock still in the proper position. Sector Commanders could ask pilots to turn it on by asking "Is your Cockerel crowing?". There were two common versions of pip-squeak, one with the clock located in the cockpit, and a second that used a remote clock system. The later placed the "Master Contactor" in a box in the equipment bay near the radio, and it was pre-set to the correct second-hand location for each section, prior to the mission. The "Remote Contactor" display was located in the cockpit, driven by electrical signals from the Master Contactor, whose once-per-second signals powered a stepper motor driving the second hand. This version had only a single control to turn the clock on and off to start it up at "mark", a separate switch on the radio console allowed the signal to be stopped and started while leaving the clock running. Each sector was equipped with three huff-duff sets for determining the location of the pip-squeak radios. Although in theory only two were needed, adding a third offered redundancy as well as helping reduce the chance of errors in the plotting. The stations were positioned approximately apart in as close to an equilateral triangular layout as possible. One of the three stations was co-located at the Sector Control center, with the two remote stations communicating with the center over telephone lines. At the Sector Control, a simple system was used to rapidly take a "fix". This consisted of a circular plotting board with a map on the top surface marked with the Ordnance Survey National Grid, and a series of compass angles on a protractor around the outer edge. The location of the three stations was represented by small holes drilled into the map. Weighed strings passed through the holes, and could be pulled up and across the map by the plotters. When a report was received from a huff-duff operator, the plotter would pull their string so it lay on the indicated angle; the weight (or elastic cord) on the other end kept the string taut.