Satellites are flying around the Earth at thousands of miles per hour, so at any given second one GPS satellite might be falling out of range and (hopefully) another may be coming into range. Your GPS accuracy can change by the second. In a city with hundreds of networks on a single street, that data starts to form a wifi map that works well when the maps app has no/weak GPS. Your phone sends data back to the maps company, reporting locations of wifi networks detected. My understanding is that it's not about networks you join, just networks your phone picks up on. Important note: Wifi assisted GPS is worth looking up. The Apple API tells iOS apps about signal strength using a 1-5 rating. Some apps increase the radius circle to reflect the strength/weakness of the combination of signal strengths. Now your phone actually knows how accurate it is.
Not enough strong GPS satellite signals (in a tunnel, under a storm, etc) In that case, you'll continue to see wider variation, especially when signals are weak. However, most of us will be using a more rudimentary GPS chip for a while. The combination of those satellites and that cheap will bring precision to about a 1 foot. Now Broadcomm is said to be launching dozen of new satellites with much higher precision but it requires a new chip. A weak signal can quickly reduce that to 100+ feet or even 1,000+ feet! If your phone is in position to receive 4+ strong satellite signals, most phones GPS should be accurate within 20 feet. Why is GPS better? GPS satellites use an atomic clock to send timestamped signals that are insanely accurate. However, it is supplemented by the other two when the GPS signal is weak. Here's what you need to do.Even though it might seem like Wifi should be more accurate, GPS is best. Still, if you aren't comfortable sharing your location with other people - whether you have security and privacy concerns or just don't want to - you can keep Find My iPhone on and disable Find My Friends. In previous iOS releases, the features were located in two separate apps, so iOS 14 does make it more convenient to switch between the two. The Find My iPhone app lets you track the last known location of your phone, iPad, and laptop, while Find My Friends allows you to share your location with other people and see where they are if they choose to share with you. If you don't want to share your location with your friends, you can still turn off Find My Friends in iOS 14 and keep Find My iPhone turned on. One of those adjustments: Find My iPhone and Find My Friends have been combined into one app called "Find My." This is an update that is available in iOS 14 as well. When Apple released iOS 13 in September 2019, it brought a lot of big changes to the iPhone - and some smaller, subtler ones that you may not notice at first glance.
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