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First-responder officials are applauding the recent AT&T announcement that FirstNet agencies now can access vertical-location (Z-axis) information powered by NextNav to find personnel inside taller buildings—a challenging task that has been described by many as the “Holy Grail” of public-safety communications.

Charles Werner, a former fire chief for the city of Charlottesville, Va., said he and others in the public-safety community have been working for decades to obtain vertical-location information to help them find personnel, particularly firefighters in smoke-filled buildings that need help…