TX head requires GPS??

[JStump2490]

If one were to take the time to do some reading in the "Sticky" Threads within the AntiLaser Section here on the Forum(for TX Sensor install), the answer would be found. The GPS feature is used control the activation of 'defense' mode until the vehicles speed exceeds ~21mph.

I have read that, but what I don't get is why it is needed? I don't have any problems without GPS using my current 3 head setup, so why on earth would this be required to use a TX head? I don't care what so ever that my jammer may go off under 21 MPH. Seems like a ploy to get you to spend money unnecessarily.