A method for operating a navigation system for a vehicle, particularly for
a motor vehicle, in which a travel route is calculated in a computing
circuit on the basis of a location of the vehicle, a digitally stored map
and a destination location, and is made available to the vehicle driver as
an acoustical and/or visual message, where traffic information relevant to
the travel route may be acquired via a receiver unit and a new travel time
t resulting therefrom is calculated for the existing travel route with the
aid of a predefined weighting factor G.sub.f for a disturbance event and
the length of a traffic disturbance L.sub.s, and a travel time t.sub.a is
calculated in the same manner for an alternative route, and in the event
that the travel time t.sub.a of the alternative route is shorter than the
travel time t of the travel route, is indicated to the vehicle driver. A
correction value K for the weighting factors G.sub.f is ascertained on the
basis of the length of the traffic disturbance L.sub.s, and a corrected
weighting factor G.sub.k is ascertained as a function of the correction
value K.sub.w and is used for calculating the new travel time t.
