Ford 2006 Expedition Owner's Manual page 490

Entertainment Systems
Latest map CDs
The traffic network is constantly changing due to new roads, traffic
restrictions, etc. Therefore, it is not always possible to exactly match the
digital CD map with the current roadways. To help with accuracy, always
use the latest version of the map CD for navigation.
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2006 Expedition (exd)
Owners Guide (post-2002-fmt)
USA (fus)