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First you have to locate the navigation DVD player itself. The navigation system DVD players are either under the front seats or behind the navigation screen. All you have to do to update the GPS system is remove the old GPS disc and insert the new GPS disc. The NAV system will update itself. About the only thing you may have to do is reset the region the Navigation system shows. Most of the time you dont have to do anything. It will do all the updates itself.
All FMS contain a navigation database. The navigation database contains the elements from which the flight plan is constructed. These are defined via the ARINC 424 standard. The navigation database (NDB) is normally updated every 28 days, in order to ensure that its contents are current.