Where are you orienting from?

It’s 2001 and I’m standing on an elevated ridge in the White Mountains of Maine in the United States. My map is laid out in front of me on a flat rock, and with compass in hand I’m triangulating our group’s location. We are about to immerse our team into a thick deciduous forest for about 15 miles. The orienting calculations we make now have everything to do with our success of getting to our extraction point before we run out of food and fuel. It’s these fine measurements here on this ridge that will allow us to be successful later on. And with the right understanding of our location right now, we can calibrate each bearing, shoot from tree to tree, and plot an accurate course through the forest.