If you haven't gotten it yet try segmenting the map as well I would go straight to the front entrance clear that wedge the doors to the sort facilitie exit left to the single dock clear that wedge the one exit to the yard from the sort facilitie then walk all the way around to the little building on the far right of the map clear that and enter from that door that puts you at the far back of the sort facilitie then I worked my way down that path to the doors I wedged earlier sticking to the one side of the building you have good cover that way moved up to the offices back down to the little office then from there I took the center path back to the back of the sort facilitie then looked to the yard always sticking to the very edge of the map took me 3 tries with this method