Except that the WAAS geostationary satellites are so widely separated that you can't see both at the same time, and in most locations the one visible is also ve

Except that the WAAS geostationary satellites are so widely separated that you can't see both at the same time, and in most locations the one visible is also very low in the sky and easily obstructed. Edit: apparently my info is out of date, the two new WAAS satellites have better positioning.