High-resolution GeoPDF pair for field navigation on trails behind Sayéik, spirit helper (Gastineau Elementary). In apps such as Avenza, on your phone or tablet, you can see your GPS/cell-triangulation position on this image, and lay a track. First choice is a LiDAR-derived bare-earth hillshade with modeled streams and 10-foot contours. Other layers, exported from ArcMap, are named roads and hiking trails, parcel boundaries, and our named wetlands from the CBJ wetland survey project. Thick blue lines are “subsheds,” also mapped during that project. For example, the divide separating Lawson from Bear Creek subsheds runs through the bogs where Discovery naturalists guide walking tours from the school.