Can local 911 systems locate someone immediately if they don't know their location?

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Can local 911 systems locate someone immediately if they don't know their location?

When seconds mattered deputies in Florida were faced with a 911 call that left them trying to locate a young woman trapped under water in her car. That crisis had 21 News questioning if our 911 systems here in the Valley are equipped to locate someone immediately in a similar situation? In Hillsborough County, Florida, 20-year-old Amanda Antonio called 911 for help when a car cut her off and her vehicle flipped over and began to fill up with water.  She was trapped and deputies...

Source: Can local 911 systems locate someone immediately if they don't know their location?