I recommend a GPS course and a good hand held like my Garmin etrex which has Glonass technology, when i enable it, it gives me way more satellites than just gps. It was a few hundred and another hundred for a card/chip. The GPS logging, course I took saved my butt many times as property owners at times mark there lines way off, and the guy who cuts the tree thats over the real line is the one who gets sued. It gives a guy a lot more confidence when hunting areas with tough public access. And believe me or not it's consistently accurate. Thats why i have the utmost confidence that i crossed the corner, whether or not corner crossing is legal i still don't know?