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 2 description
+25% to travel speed on the world map per rank (+50% total). As time is not a real concern, the perk is useless.
The manual erroneously states that the Outdoorsman requirement is 60%.
Behind the scenes
The image for this perk is a reference to the Flash comics.