I use a Garmin e30 Trex. With the amount of BLM and National forest in Cali its imperative to have. You can even download areas with satellite view, terrain, and boundaries. Plus the way-points, active tracks and POI's. I even have a map that is specific to BLM which layers over the other maps. I can load that into my little gps that we keep in the car and it shows public property boundaries while you are driving down the road. My phone is a LGg2 and doesn't come close to the capabilities of a GPS.