The trouble began when Smith was pathfinding on the upper Athabasca for the new transcontinental.
Wonderful as they were, with their pathfinding and all that, they could hardly penetrate to his humble, sequestered little home.
Fremont's "pathfinding" virtually completed the exploration of the country.
pathfinder path·find·er (pāth'fīn'dər)
A filiform bougie for introduction through a narrow stricture as a guide for the passage of a larger instrument.