Info from Google search: An Apple Watch cannot detect a pacemaker in a dead person, as the watch is designed to monitor human pulse and blood flow, not electronic device signals. If a person passes away, the Apple Watch will stop recording heart rate data because it can no longer detect blood flow or pulse, and it may lock itself, thinking it is no longer on a wrist.
A pacemaker can connect to a cell tower via radio frequency. Also, it can connect to an app via Bluetooth when in close range. It reports data via a handheld medical device @/or cell phone. Sitting in a medical facility, it can connect to a laptop to the extent that a technician can make your throat tickle. But IMO, the best way to prove a general vicinity and also that she is alive, is to intensely scan cell tower data. I heard there are 41 towers in the wide area
Details on Apple Devices:
“The main Apple apps to connect to a pacemaker for remote monitoring are provided by device manufacturers, primarily the
MyCareLink Heart™ app by Medtronic for Medtronic devices and the myMerlin™ app by Abbott Cardiovascular for their devices. “
These access the pacemaker data on an iPhone or iPad.
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