In February 2001, while driving on the state turnpike to her home in Miramar, Florida, 32-year-old Karla Gutierrez lost control of her BMW 328i and skidded into a canal. She dialed 911 on a cellphone and explained her predicament as the vehicle slowly sank. But since Gutierrez couldn't describe her precise location-"I'm not sure where I am," she told the operator-Miami-Dade County rescue units didn't know where to go to save her. By the time a passing patrolman noticed a busted fence by the accident site and found Gutierrez, she was dead.