About 6 - 7 years ago, my brother bought me one of those handheld golf course GPS devices. It was essentially a Windows Pocket PC with the golf GPS software pre-installed. There was no "locking" of the device at all. In fact, I even purchased GPS navigation software for it separately, and used it for navigation instead of using it for golf. I actually used it more as a music player using the built-in Windows Media player. Admittedly, it was a little dangerous to using while driving since the UI was designed for stylus and not fat fingers.