She was constructed on the same plans of another sail training vessel based in Kingston named St. Lawrence II.

Pathfinder's last major re-fit was in 1994 when she was out of service for a year whilst the interior, exterior, all systems, machinery and rig of the vessel was completely re-furbished.

The ship was retired from Toronto Brigantine's fleet and sold to a private buyer in 2018.

She has since been returned to service alongside TS Playfair and from her home port of Hamilton Ontario.

Pathfinder is divided into six watertight compartments from fore to aft the: forepeak (general bosun stores, anchor chain bins); petty officer's mess (sleeping space for 4 petty officers); seamen's mess (sleeping and living space for up to 18 trainees, also includes the galley); engine room (area for engine, generator and batteries); wardroom (sleeping and living space for 6 wardroom officers, also includes the captain's cabin, a separate but not watertight compartment)and the afterpeak (mooring line and fender storage and steering gear)