From The Collaborative International Dictionary of English v.0.48 [gcide]:
Pathfinder \Path"find`er\, n.
One who discovers a way or path; one who explores untraversed
regions.
[1913 Webster]
The cow is the true pathfinder and pathmaker. --J.
Burroughs.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
pathfinder
n 1: someone who can find paths through unexplored territory
[syn: scout, pathfinder, guide]