Plan an alternate route in heavy traffic, be rugged and waterproof, and be able to communicate easily with other electronic devices. And, you would get all of this at an affordable price. If you are planning to use an established trail make sure you know exactly where it will take you and how long the trip will take. Know what turnoffs you will encounter along the way. There is certainly no shortage of GPS devices available, so doing a little research can save you a lot of time and hassle.