IPod touch 5G has no GPS built-in, then why Google map does show your location without wifi connection?

Question

Am confused with the above, based on Apple's web site, iPod touch 5G has no built-in GPS, see this page:
https://www.apple.com/ipod-touch/specs.html
However when I bring my iPod touch 5G to outside where no WiFi available, but when I move, the Google Map
on the iPod touch 5G does follow me and  show my current location, though the location accuracy is not high, say, errors can be
around 10 meters or higher.
Wonder how the location information is acquired on iPod touch 5G if no GPS, no WiFi?
Thanks
David

Answer 1

Because wifi networks are within range of the iPod and the iPod detected them and the iPod already have the location of the networks on the iPod.
You do not have to be connected to a newwork to use the location of a netowrk.
For location the iPod uses the location of nearby routers that are in Apple's database of routers and their location. Thus it appears that Apple's database is incorrect. You do not have to be connected to the router, just within range.
Apple periodically updates their database based on information they obtain from iPhones, The iPhone has to have turned on the option to send info to Apple. no one has found another way to get the location of a router added/corrected.
  You can confirm that by going to well-know place with wifi like Starbucks or McDonalds