Chevrolet 2011 Corvette Navigation System Navigation Manual page 83

The vehicle is equipped with tire
chains.
The tires are replaced.
The tire pressure for your tires is
incorrect.
The tires are worn.
The first time the map DVD is
inserted.
The battery is disconnected for
several days.
The vehicle is driving in heavy
traffic where driving is at low
speeds, and the vehicle is
stopped and started repeatedly.
If any of those problems occur,
the system may need to be
re-calibrated. This could be due
to tire pressure differences, or if a
spare tire is installed. To calibrate
the system, see
.
Inappropriate route guidance can
occur under one or more of the
following conditions:
A turn was made that was not on
the route.
Route guidance may not be
available when using automatic
rerouting for the next right or
left turn.
The route may not be changed
when using automatic rerouting.
There is no route guidance when
turning at an intersection.
Plural names of places may be
announced occasionally.
It may take a long time to
operate automatic rerouting
during high-speed driving.
Automatic rerouting may display
a route returning to the set
waypoint if you are heading for
a destination without passing
through a set waypoint.
The route prohibits the entry of
a vehicle due to a regulation
by time or season or any other
regulation which may be given.
Some routes may not be
searched.
The route to the destination may
not be shown if there are new
roads, if roads have recently
changed or if certain roads are
not listed on the map DVD. See
To recalibrate the vehicle's position
on the map, see
.
.