I'm confused by this thread. In reading other threads, it seemed that it was possible to use a Garmin 430 (non-WAAS) for nav and a separate, higher data-rate WAAS GPS 'puck' into serial port #1 for position info and faster screen updates, even for older 4500S units. Is this incorrect? Must I upgrade to a 5000 series screen to add a WAAS GPS puck for position?

Thanks,

Charlie
(building RV-7 with a new-to-me 4500S)