Fine my iPhone
What is going with location going crazy is not been accurate and is really disturbing
iPhone 12 Pro, iOS 16
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Read this document for how to use the Find My app to locate a missing device or item --> Use the Find My app to locate a missing device or item - Apple Support
The chances of locating a device depend upon which features you selected in:
Set up Find My on your iPhone, Mac, and other devices - Set up Find My on your iPhone, iPad, iPod touch, or Mac - Apple Support
An erratic location could be due to it changing from one location type to another. Some are very precise and others might not even show the correct city.