![]() Also companies like Garmin get their map data from a variety of sources. ![]() The Maps are typically updated much more frequently. When you are using a Garmin, TomTom Magellan Etc. When you buy a DVD update it might already be 6 months old. GM may only buy the map once a year and it may take GM another several months to integrate the map into the GPS DVD release. GM and other car manufacturers typically buy their GPS maps from companies like Navteq.
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