Within a 1000 kilometer radius of the war base, the signal was quite decent.
If the base wished, it could contact human martial artists in the area at any time, even roughly locate them using intelligent ring-tablets, though it could be difficult to contact them directly beyond 1000 kilometers.
By using the positioning system, if human martial artists came within 3 kilometers of each other within the 1000 kilometers, they would usually receive an induction to prevent friendly fire.
Not detecting anything?
There were three possible explanations: one was that the martial artists didn't want to reveal their whereabouts and had turned off their intelligent ring-tablets' positioning.
Another was that the intelligent ring-tablets were lost or broken.
And the last possibility was—the others weren't human martial artists, but aliens.
Still, this area was only 600 kilometers from the Human Race's war base and was rather within their sphere of influence.