gabrielc - I have that answer on the opposite side (going up the way) because the endgame suggests the positioning is at a certain point in the plot , at least that's how I've interpreted the phrase underneath the grid.
there are only 2x 11 letter answers, brendan - one for each grid (a clue has just been given to one of them - but I have it upturned in the first column, and it's been suggested for the other place running down the way... best wait for confirmation).
I think they are, gabrielc - but I got lucky (if I'm right, that is) getting the right orientation straight off, so didn't bother plotting the other route.
I'm not entirely sure, so I'll wait and see what others make of it.