I posted this in an earlier discussion about the ESG:
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Download and install the Stratus Horizon Pro app on an iPad/iPhone and turn the "Open ADSB" switch to the On position while it's connected to your 3i.
Or
Download and install the FltPlanGo App and connect that to your 3i. This on apparently turns on the Stratus Open ADSB automatically, and will then allow iFly to gather the information.
There may be other ways, or apps that can accomplish this, but these are the only two that Stratus/Appareo told me about.
iFly will connect to the Stratus 3i WiFi without the Open ADSB switch turned on, but iFly will not be able to get any information from the Stratus 3i.
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Another thing of note that I've discovered. At least twice, the "Open ADSB" has needed to be turned on with my iPad. I'm not sure what is causing this, perhaps if it doesn't connect with a WiFi source for a given amount of time, perhaps it just resets every so often. I really don't know. Just be aware that you might want to make sure you always have a way to turn the Open ADSB feature on each time you fly.