This cache is the bonus final for the "Before the Bridges" Adventure Lab series. To obtain the coordinates, you must complete the adventure lab series, with each stage giving you partial coordinates towards the final. The adventure lab series is available using this link.
The final cache is located in Wareham a short ways over the Marion border. It is a decon container on ground level a short ways into the woods. Please rehide extremely well.
N 41° 44.ABC W 70° 46.DEF
Hope you enjoy the tour "before the bridges!"
You can validate your puzzle solution with certitude.