For good reason, as the actual signals (other than course or heading error) come from the navigator and the G5 system has no way of driving a relay or such to switch the +L/+R, etc signals between navigators, so if you were to hook that up, your error might be coming from the proper navigator but the other signals could be coming from the not-selected ones.
not so fast boys...
under the limitation section:
"cannot interface with dual navigators if G5 is interfaced with a non-Garmin autopilot"
Garmin has never been happy nor helpful to third party autopilots since around the time they entered the autopilot market. G5 showed up around then and seemed purpose built to attach to theirs.
Nate,
The G5 connects to numerous third-party autopilots. It merely does not provide attitude to them: Only course, heading, and course deviation. And providing the attitude to an autopilot is a whole different ball of wax than displaying it on a screen.
Rate-based autopilots, such as S-TEC, can work just fine with one or two G5s in the panel, because they're driven by a turn coordinator that you must keep.
Attitude-based autopilots must keep their AI the same way the rate-based ones have to keep their TC.
not so fast boys...
under the limitation section:
"cannot interface with dual navigators if G5 is interfaced with a non-Garmin autopilot"
mine had a mechanical flip switch that will switch between 480 and SL-30, that had to be taken out when I went with G5, I thought I can get it going when they enable this dual nav function... but guess notThat's no different than without G5s for me. My STEC AP is coupled to the GNS430W only for course tracking. And I don't have a second GPS unit so no big deal for me.