Doug Vetter wrote:

The GPS unit must also be installed within about a foot laterally of the
pilot's viewing centerline (the Attitude indicator, usually) and no
lower than the lowest flight instrument. This means that both older
Beech and Cirrus drivers will need to install annunciators (more $$$).

Wasn't this also a requirement of the non-WAAS IFR installations?

The 480 actually has a few waivers of the distance requirement for
Bo's and the like. It was just easier for me to install the GPS/NAV
annunciator though.