2 GPS units

Others have asked similar questions, but I have not seen a satisfactory answer.

I'm running PixHawks, and I have 2 GPSs.  I have the option of 

1. USE BEST  or 

2. BLEND

I understand what "Use best" means, but I have noticed that I get a bit less position "drift" when I choose BLEND, but I wonder what happens if one GPS fails. or loses and regains signal.  Does it recover gracefully?  I guess I could pull the connector and try it, but I would like to know what it is supposed to do.

Also, the BLEND MASK defaults to "5", does that mean it "blends" X, Y and delta XY (speed)?  Does it not look at altitude?

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