- A field guide to hiking the SGM and ANF, detailing the hikes, the trails, the places, and much more. All SGM hiking information available on the web is indexed, including my trip logs (detailed record of time, mileage and altitude along the trail). The hikes are shown on a series of maps, and sorted separately by mileage, Robinson trip number, website and distance from Caltech.tchester.org/sgm/hikes.html