Tim,

If I understand correctly, SE2 uses an in-built baro sensor so that my "own ship" altitude is correctly detected by SkyDemon with reference to 1013.2 hPa. That is necessary for SkyDemon's collision avoidance algorithms to function correctly as my ADS-B Out altitude is also with reference to 1013.2 hPa.

I believe SafeSky detected aircraft transmit their altitude with reference to WGS84, otherwise known simply as GPS altitude.

So, will SkyDemon's collision avoidance algorithms work correctly (and accurately) if a "SafeSky" detected aircraft is close by, or is seen as a potential collision risk?

I am a bit confused regarding the different altitude references used by SkyDemon/SE2/SafeSky. 

Lastly, I presume there aren't any integration issues with running SkyDemon and SafeSky together on a single, small screen, Android smartphone, but also communicating with my SE2?

Thanks

Tony

GDL90 devices should be sending us both the barometric and GNSS altitude of your own aircraft (device). Therefore, when they almost always only send us the barometric altitude of other aircraft, we can do the calculations such that we are comparing like for like when it comes to proximity detection.

Since SafeSky does its own processing of traffic, and integration of other receivers, I couldn't say exactly what it's doing.