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The fleets might be the police department, the fire de-
partment, utilities, and city administration. The police
might decide to further divide its fleet into subfleets such
as dispatch, tactical operations, detectives, north, south,
east and west side patrols, and supervisors. All the avail-
able police radios would then be assigned to one of the
police subfleets, letting the police centralize their com-
munications and control the type of users on a single
system. Determining the exact fleet-subfleet hierarchy
for a particular area is referred to as fleet map program-
ming.
The disadvantage of a Type I system is that the brief
burst of data sent when a user transmits must contain
the radio’s ID and its fleet and subfleet. This is three
times the amount of data a Type II system radio sends.
Since the data capacity of Type I systems is limited and
the amount of data increases with each user, Type I sys-
tems usually accommodate fewer users than Type II
systems. Nevertheless, Type I systems are still in use.
There are also
hybrid
systems which are a combination
of both Type I and Type II. Your scanner defaults to
monitor Type II systems, but you can change to Type I or
a hybrid of Type I and Type II systems by selecting a
preprogrammed fleet map or creating a custom fleet
map for your area (see “Scanning Type I and Hybrid
Trunked Systems” on Page 44).
You do not need to determine the fleet-subfleet hierar-
chy for Type II systems unless you are tracking hybrid
systems that contain both Type I and Type II systems.
SETTING THE SCANNER TO THE
TRUNK TRACKING MODE
Repeatedly press
TRUNK
to switch between the scan-
ner’s conventional and trunk tracking modes.
20-520.fm Page 33 Wednesday, August 4, 1999 3:06 PM