Why do they put GPS in new AC WISP radios nowadays?

Why do they put GPS in new AC WISP radios nowadays?
WISP AC PRISM uses GPS
I was helping a friend set up a Verizon femtocell way out in the boonies
Verizon femtocell setup
And in the debugging process I noticed that new WISP radios nowadays have a
GPS light when I checked the signal strength indicators on the transceiver.
My rooftop radios do NOT have GPS - what is the use of GPS in WISP today?
My old Wi-Fi APs