If you were watching "Mark and Sam After Work" on thetube then this is the one you saw.
http://www.boriskalinin.com/measuring_tape.htm I have it. It works on GPS, no need of a cell signal. It seems to have a resolution of about 3 yards, so as a percentage, it gets more accurate as you stretch it out. It costs like $4 I think, and works as well as any. It is dirt simple. There is literally one single button.