what dose navigation do

Is this a trick question?? A GPS or Navigation System allows you to set a destination from Point A to B (or anywhere in between). Some also give you traffic alerts (i.e. accidents, roadside construction, traffic jams, etc). What your specific one does in the MB can be found out by reading your Owner's Manual.

This one unfortunately does not give you traffic alerts, unless you pay MB for their connect program....that's and annual fee and not cheap. Your smart phone will give you all that information with many apps that are available.