Find my iPhone gave wrong location

There are 3 ways the iPhone will attempt to determine your location and the process starts with the fastest, but least accurate method in this order:

• Wifi - If the phone is connected to Wifi, it will get the location from a database of locations provided by the Access Point it is connected to. This is the least accurate, but returns a location immediately.
• Cellular - If the phone is able to guess the location from triangulation with 3 different cell towers, then an approximate location will be determined. This takes slightly longer than WiFi and available only if a location can be determined by the 3 towers.
• GPS - This takes the most amount of time to determine the location, but is the most accurate. You will see a location determined by at least 1 of the previous and less accurate methods first and after a GPS location can be determined, that location will update on Maps and Find My by appearing to move the blue dot to this location.

Check if the responses to a question similar to yours might be of some help: „Find My“ App shows wrong location for fr… - Apple Community