Abstract: A vehicle system comprises: a detector for detecting the position and direction of a vehicle during its displacement; a database of mapping information; a database of gradient information; a display for presenting mapping information relevant to said vehicle's position and its anticipated displacement path; said display being configured to indicate the option of freewheeling; and a controller which, dependent upon the measured speed of said vehicle and predetermined gradient information for said anticipated displacement path, derives a signal indicative of the extent of freewheeling if said freewheeling option is taken.