Good GPS units for hikers are the Satmap Active 12, the Garmin eTrex 30X and the Garmin Oregon 650t. These units all have advanced features for hikers and others who enjoy outdoor adventures.
The Satmap Active 12 is great for hikers, hunters, backpackers and geocachers. It is a little bit on the pricey side, but makes up for it with a clear, large display, a user-friendly interface and a durable design.
The Garmin eTrex 30x is a convenient GPS unit that has side buttons in addition to front buttons, is lightweight and has a long battery life. The main disadvantage is that is has a smaller screen.
The Garmin Oregon 650t has a larger touch screen, dual orientation views and extra features, such as a barometric altimeter and accelerometer.