The Pathfinder is better able to find the shortest route. With this Perk, your travel time on the World Map is reduced by 25% for each level.”— Fallout and Fallout 2 description
A world map travel perk that's fairly useless, as time is almost never a factor, especially in Fallout 2 after acquiring a car.
Behind the scenes
The image for this perk is a reference to the Flash comics.