Pulse-wave
A specific kind of pulse-wave was given off by the operation of a TARDIS's power source tapping into the Eye of Harmony, and could be picked up by sophisticated instrumentation aboard a TARDIS while in flight within the Time Vortex. The "pattrn" of the wave could then be analysed to detect the source of the anomaly and whether or not the source of the power release was moving. (GAME: "Temporal Anomaly" [+]Part of The Legions of Death, Loading...{"namedep":"Temporal Anomaly","1":"The Legions of Death (game)"}) Such a pulse-wave was an extreme example of the time field disturbance effect routinely caused by the transmission of Eye of Harmony energy through th Vortex. Such anomalies were normally "so small as to be almost unnoticable", only turning into the highly noticeable "wave" if the power was not used internally by the TARDIS but diverted out of it in the physical world, (GAME: "Player's Handout" [+]Part of The Legions of Death, Loading...{"namedpart":"Player's Handout","1":"The Legions of Death (game)"}) as was the case when the War Chief used his TARDIS to power his hypnotic rho wave generators. (GAME: "The War Chief's Equipment" [+]Part of The Legions of Death, Loading...{"namedpart":"The War Chief's Equipment","1":"The Legions of Death (game)"})