I had the initial one year complimentary subscription to Teleaid. The only
time I ever used it was during the initial configuration at delivery. I did
a factory delivery of my M-Class, so I was sitting in the MB-USI Alabama
factory when I was going through the configuration. The Teleaid operator
was verifying my location and said I was on an "unnamed county road in
Tuscaloosa, Alabama". I found it funny that they didn't even know that this
was the location of their own factory!
As for the accuracy, it should be as good as any commercial GPS unit. Keep
in mind that the Lojack-style system is handled by Teleaid, which is
standard on all ML's and available on any MBZ model. It uses both an analog
cell phone and a GPS receiver. If the cell phone is out of range, then the
system is worthless. The ML also offers an optional GPS navigation system
that uses the MCS screen and a CD-ROM along with a tap in to the Teleaid's
PS receiver. This requires no subscription service, but also no
Lojack-style features because it is nothing more than a GPS receiver with a
map overlay. It is fairly accurate, or at least as good as most any GPS
system out there. It's major flaw is that prior to 2004, it was a CD-ROM
based system so you had to buy multiple discs to cover the entire US, but
the newer models are DVD-based.
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