
Subscription-based satellite broadcast weather data still beats ADS-B FIS-B data for tactically threading the needle through real weather. SiriusXM delivers more data, it works on the ground and has tighter image resolution. But when ADS-B got rolling, the budget-driven market generally favored subscription-free FIS-B, accepting its limitations rather than forking over $1000-plus per year on an XM subscription. Still, that didn’t stop recent letters and phone calls from readers complaining that Garmin’s GDL69 SiriusXM weather system won’t work with the popular ForeFlight tablet app, but it does with Garmin’s own Pilot app.