If The System Needs Service; Database Coverage Explanations - GMC SIERRA DENALI Navigation Manual

If the System Needs Service

If you are still experiencing difficulty with your Navigation
System after reading this information, see your dealer
for assistance.
Ordering Map DVDs
The map DVD in your vehicle is the most up-to-date
information available when your vehicle was purchased.
The map DVD is updated once a year, provided that
the map information has changed. To order a new DVD,
contact your dealer.
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Database Coverage Explanations

Coverage areas vary with respect to the level of map
detail available for any given area. Some areas will
feature greater levels of detail than others. If this
happens, it does not mean there is a problem with the
system. As the map DVD is updated, more detail
may become available for areas which previously had
limited detail. See "Ordering Map DVDs" earlier in
this section.