How does "Find iPhone" work for a wifi-only iPad?

My wife's iPad is in out home on a satellite internet connection, in the country, connected to our router which assigns it an internal IP address. Yet when I log into Find iPhone from my iPhone, it shows up right inside the house most of the time, within 200' or so other times. Now the "circle of uncertainty" is larger then my wife's iPhone, it's still pretty accurate given the way it's connected. This baffles me.
Thanks,
Gamma

Philly_Phan wrote:
That doesn't answer HOW the database determined the router location to begin with./message-abuse!input.jspa?objectID=28092111&objectType=2
It does – the OP is using multiple iOS devices, the iPhones have GPS which is used to submit data to Apple via the diagnostics & usage. It may also come from other iOS users who have the same feature enabled.
Philly_Phan wrote:
Drew Reece wrote:
I suspect the reason that your cellular iPad is getting accurate locations is because your modem is broadcasting a wifi access point. IP's are a poor indicator of location, despite what CSI tells you
That access point will be added to Apples database. Your iPhone has a setting that will help with this… 'Settings > General > Usage > Diagnostics & usage', if Automatically send is enabled then you are reporting anonymous data to Apple, including the location of the networks you use, the same network that is in range for the iPad. Apple is using iOS to crowd source the data.
Not true at all. A cellular iPad also has a GPS receiver and it obtains location information from GPS. GPS signals are separate from and completely unrelated to both the Internet and the cellular telephone network. GPS signals come directly from the GPS satellites. They provide signals that allow GPS receivers to calculate latitude and longitude information. Software inside the device translates latitude/longitude into landmark information, such as street addresses.
I was referring to the GPS on the iPhone.
I know how GPS works thanks, I can see 4 satellites in this hemisphere, the others are out of view
I was also assuming this was a wifi iPad (no cellular, no GPS) - hence the reason for the original poster surprise. However I may have simply read 'wife's iPad' as 'wifi iPad'?

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