we did the pump gap loop from the Silvermine trailhead, a few hundred yards up the little road from the parking area on the river. the trail map posted there lists it as 5.6m and shows a very different trail configuration then what this app shows. also, this app consistently showed me well east of the route according to the map on this app. so I don't know what to think..be careful, follow the yellow blazes for the route we did, we were on trail just over 3 hrs & are average hikers at worst I'd say.