In 2005 Jessica's law provided for lifetime monitoring of SO's.
"2005 Florida H 1877
Requires that offenders who are designated sexual predators and others who have committed specified sex crimes, particularly those against children, must upon release and for the rest of their life be subject to GPS "active electronic monitoring," which can monitor location and movement. Imposes a mandatory sentence of 25 years to life for many offenders who commit crimes against children. Toughens penalties for failure to comply with registration requirement, including penalties for those who harbor a sex offender in violation of duty to register."
From a Press Release from FL Corrections:
"October 8, 2008 For More Information
Contact: Public Affairs Office
(850) 488-0420
Correctional Probation Officers Using Technology to Better Track Sex Offenders
...
The Mobile Data Access System, dubbed MDAS, provides real time updates on offenders to officers both in the office and out in the field via laptop. The program, created by DC staff in-house, also gives probation officers instant access to law enforcement data and contacts, and GPS location data for sex offenders who are on active GPS monitoring. The GPS tracking ability is particularly significant because if a sex offender is not home but is on GPS, the officer can pull up their location on the laptop and track them from street to street, if necessary."
From an article called "Attack of the Perv Trackers":
http://www.wired.com/science/discoveries/news/2006/11/72094
"GPS will not prevent a crime," said Steve Chapin, CEO of Pro Tech Monitoring, a manufacturer of GPS tracking devices. "It's a crime deterrent. It has proven to be a good tool, but you can't oversell it -- there's no physical barrier that it creates that can prevent a crime." Chapin said his Florida-based company tracks about 10,000 people, and he thinks other companies track a few thousand more. Offenders wear an ankle bracelet -- Chapin said it can be hidden under a sock -- and keep the transmitter nearby.
So, from my reading, FL requires active tracking which means you can always know precisely where someone is located but there is no one watching everyone all the time which is probably obvious as that would be extremely labor intensive. There are also exclusion zones which trigger an alarm and which would be set individually based upon the individual pervert and his location.