My GPS track. We hiked a service road up to point just beyond Boyle Brook where we reached Camp III building and Quad base station. We then hiked Walking Boss Ski Trail to summit of North Loon over 2000' elevation gain. This took us 2 hours. After a short break we hike the Out of Bounds Ski Trail to the point where spur ridge for Black Mt takes off and started our bushwhack at 11:23. We got to the summit by 1:00. The ascent whack was relatively easy except for the last 3-400' of the summit cone which was guarded by blowdown terrain. Descent route does not look all that different from the ascent route, but proved to be a bitch taking 2 1/4 hours compared to 1 1/2 hours for ascent.