I thought all the post-430 panel mounted boxes were similar, but let's just say G1000 and GTN750 for the sake of argument.Which Garmin box?
When looking at the weather on a Garmin box, how does one tell whether the data came from XM or from ADS-B In? If the two data sources disagree, which one does it use to display?
Depends which one you asked for. If you have more than one weather source connected to a GTN 750 and you hit "Weather", you'll get a menu allowing you to choose among the options you have installed, which can include not only XM and FIS-B, but also Connext (through the Iridium network and GSR 56), onboard radar, and stormscope.
Cool, thanks. The G1000 doesn't give a data source menu that I can see.