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Interpreting Alerts Interpreting Alerts
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Although Passport has a comprehensive
warning system and this handbook is as
complete as we can make it, only experience
will teach you what to expect from your
Passport and how to interpret what it “tells”
you. The radar alerts you receive are
affected by the specific type of radar being
used, the type of transmission (continuous
or instant-on) and the location of the radar
source.
The following examples will give you
an introduction to understanding Passport’s
warning system for radar, laser and safety
alerts.
Explanation
You are approaching a continuous radar
source aimed in your direction.
An instant-on radar source is being used
ahead of you and out of your view.
An instant-on radar source or laser source is
being used nearby. This kind of alert
requires immediate attention!
Laser is being used in the area. Because laser
is inherently difficult to detect, any laser
alert may indicate a source very close by.
A moving patrol car with continuous radar
is overtaking you from behind. Because
these signals are reflected (reflections are
increased by large objects), they may or may
not eventually blend into a solid tone even
when the patrol car is directly behind you.
Explanation
You are approaching a radar unit concealed
by a hill or an obstructed curve.
A patrol car is travelling in front of you with
a radar source aimed forward. Because
signals are sometimes reflected off of large
objects and sometimes not, the alerts may
seem inconsistent.
A patrol car is approaching from the other
direction, sampling traffic with instant-on
radar. Such alerts should be taken seriously.
You are driving through an area populated
with radar motion sensors (door openers,
burglar alarms, etc.). Since these transmitters
are usually contained inside buildings or
aimed toward OR away from you, they are
typically not as strong or lasting as a real
radar encounter.
CAUTION: Since the characteristics of
these alerts may be similar to some of
the preceding examples, overconfidence
in an unfamiliar area can be dangerous.
Likewise, if an alert in a commonly
traveled area is suddenly stronger or
on a different band than usual, speed
radar may be set up nearby.
Alert
Passport begins to sound slowly, then the
rate of alert increases until the alert
becomes a solid tone. The Signal Meter
ramps accordingly.
Passport emits short alerts for a few seconds
and then falls silent only to briefly alert and
fall silent again.
Passport suddenly sounds a continuous tone
for the appropriate band received. All
segments in the Signal Strength Meter are lit.
A brief laser alert.
Passport receives weak signals. These
signals may be a little stronger as you pass
large, roadside objects. The signals increase
in frequency.
Alert
Passport alerts slowly for awhile and then
abruptly jumps to a strong alert.
Passport alerts intermittently. Rate and
strength of alerts may be consistent or vary
wildly.
Passport alerts intermittently. Rate and
strength of signal increases with each alert.
Passport gives an X-band alert intermittently.