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For the record, I took my NAVI GT31 GPS to my flying spot to compare sat reception between its GPS receiver and that of the Phantom.
The GT31 showed "In view 12" and "Tracking 9". My Phantom never showed less than double digits, at one point showing 15 sats! This is one higher than the max according to http://satpredictor.navcomtech.com/ but that's probably because the copter was higher than the 10 meters default of http://satpredictor.navcomtech.com/
All in all, my (for now, cautious) conclusion is that the GPS mod is not required, at least not on my Phantom, which is the P2 Vision Plus. But I'll take out the GT31 every time from now on to get a more significant average.
The GT31 showed "In view 12" and "Tracking 9". My Phantom never showed less than double digits, at one point showing 15 sats! This is one higher than the max according to http://satpredictor.navcomtech.com/ but that's probably because the copter was higher than the 10 meters default of http://satpredictor.navcomtech.com/
All in all, my (for now, cautious) conclusion is that the GPS mod is not required, at least not on my Phantom, which is the P2 Vision Plus. But I'll take out the GT31 every time from now on to get a more significant average.