CircuitSync, something nobody brought up yet is that the iPhone model she has makes a HUGE difference in how well location tracking works.
##iPhone Models and GPS Hardware##
Not all iPhones have the same GPS chip. Here is a quick breakdown:
iPhone 8 and older: These use the older Qualcomm GPS modem. Location accuracy is decent outdoors but struggles a lot indoors. If she has one of these, that might explain a big chunk of your problems.
iPhone XS, XR, 11 series: These switched to Intel modems for GPS and cellular. The XS and XR had some known GPS issues at launch that Apple fixed with software updates. But even after fixes, indoor accuracy was not great.
iPhone 12 series: This is where things got noticeably better. Apple put in a Qualcomm X55 modem and the GPS accuracy improved a lot. The ultra wideband U1 chip also helps with precision finding.
iPhone 13 and 14 series: Solid GPS performance across the board. The 14 added satellite SOS which means even without cell service she can still send emergency messages and share location via satellite.
iPhone 15 and 16 series: Best GPS hardware Apple has ever shipped. The 15 Pro and 16 models have the second generation ultra wideband chip and precision finding is insanely accurate.
##Which One is Best for Tracking?##
If you are thinking about upgrading her phone, the iPhone 14 is the sweet spot in my opinion. It has satellite emergency features, great GPS accuracy, and the price has dropped since the newer models came out. The satellite SOS alone makes it worth it if safety is your main concern.
##The iOS Version Matters Too##
Whatever phone she has, make sure it is on the latest iOS. Apple improved the Find My network in iOS 16 and added the Check In feature in iOS 17. Running an old iOS version on a newer phone is like buying a sports car and putting regular gas in it.
##Ultra Wideband Matters##
If she has an iPhone 11 or newer, it has the U1 chip. This is the tech behind Precision Finding. When you are nearby (within Bluetooth range), you can get directional arrows pointing you straight to her phone. Super useful in crowded places.