On a related note - Apple wardriving
https://en.wikipedia.org/wiki/Skyhook_Wireless
A decade ago I was employed (informally as a contractor) and issued a PDA with an accessory "black box" that had GPS & wireless capability which plugged into my car's power tap. The whole contraption, wired together as it was, sat on the car dashboard although the PDA itself was to be attached to the windscreen in typical smartphone fashion on a l-o-n-g flex-neck the likes of which I've never seen since. The PDA booted right into a wifi logging program that recorded GPS coordinates/MAC addresses/time & date of every passing access point - a precursor to what every smartphone does these days via tiny embedded chips...but with a much stronger external antenna. Unfortunately no GPS mapping available to Yours Truly the driver of the automobile, as all results were recorded directly into the PDA.
VERY unfortunate as I would simply receive an emailed territory map and be tasked with driving up and down every accessibly road within said territory. Not too bad in the countryside but in crowded areas I had to highlight (on my printed map) each roadway as traversed - all those Avenues A/B/C and dead-end side streets get confusing after a while. Had to drive for at least 30 hours weekly (at $15 an hour and pay for my own fuel) to remain on contract but could freely choose hours/days for the task. At the end of each day I would upload the day's records via a stop at the local Starbucks, about the only widespread free wifi outfit at the time at least here in the U.S.A. One particularly long 12-hour day (spent in a major city) there were upwards of 100,000 results uploaded...and this was back in 2004!!
I could stop at any time to take in the sights/food/whatever but also had to log such "timeouts" which were easily tracked by Skyhook. I even ended up annotating the maps with exceptional sightings as I drove up (and often back down) every single local street in an aimless fashion always worrying the authorities would notice and label my car as suspicious.
Best job I ever had! Despite the seeming tedium I found enjoyment in the variety of neighborhoods spied upon, fully satisfying some kind of wanderlust in the process. When I finally got a Real Job it was sort of sad to give it up. I had no idea but apparently Skyhook was providing this data to Apple for their (at the time) GPS-less mapping functions.