This paper argues for the use of landmarks (for example, traffic lights, ch
urches, petrol stations) within the turn-by-turn visual and voice direction
s given by in-vehicle navigation systems. Such prominent features of the dr
iving environment are consistent with basic human navigational strategies,
are valued by drivers, and have been shown significantly to improve the usa
bility of electronic in-car navigational aids. For future systems actively
to include such information, it is critical that (a) only 'good' landmarks
are used, (b) such landmarks are presented to the driver in the most approp
riate way, and (c) the practical needs of industry are fully accounted for.