Speaking partly from a technological standpoint and partly from that of
someone who trained rescue professionals:

I would eschew cell phones for this purpose, because in a hurricane the
cellular infrastructure is quite often one of the first things to fail,
either because it's overloaded, power has failed, towers have fallen, etc.
It's far less fault-tolerant than POTS over copper lines.

An economical and reliable alternative is a detailed book of maps such
as the DeLorme Atlas and Gazetteer for Florida.  (You probably don't
need the latest edition; buy a used copy offline/online.)  The upside
of this is that it'll work when telecom/power infrastructure has failed;
the downside is that it doesn't provide real-time information.  (More
about that below.)

In addition: don't wait until it's time to evacuate to familiarize
yourself with multiple routes out of your area -- in particular, the
first 10-15 miles.  Get out the maps, pick a route, and test it at
least once during the day and at least once at night, so that you have
some intuitive feel for distance, time, landmarks, and possible issues
(such as bridges).  Then pick a second route and possibly a third, and
repeat the process.  (When doing the night tests, keep in mind that in
a real event the area may be without power, which means no streetlights,
no traffic signals, no building lights, etc.)  Also keep in mind that the
narrower the roadway, the more likely it is to be blocked by a single
event like a fallen tree; the larger the roadway, the more likely it'll
be repurposed as one-way-only away from the worst-hit area.

Since you're likely to be dealing with a hurricane, plan your route(s)
to avoid bodies of water: storm surges can cause flooding quite some
distance from the actual coast.  And while I know everyone has said this
1000 times, I'm going to say it the 1001st: never, ever, drive into
standing or moving water.  Yeah, it might only be six inches deep;
and yeah, there might also be a 20x20 foot sinkhole where the pavement
was a few minutes ago.

Supplement this with a cheap/used portable AM/FM/weather radio that runs
off some combination of batteries, 12V (available in a car), hand crank,
and/or solar.  (I have a Midland HH54 that fits in my hand and cost me
$11 at a garage sale.)  This will help you keep track of what's happening --
in a mass evacuation situation, traffic reports will be broadcast on AM
radio on major stations with high-power transmitters and of course
the NOAA stations will be on the air unless they take a direct hit
(and maybe even then, they're seriously well-engineered).

---rsk