Lap Pace, Average Pace, do these use footpod pace or GPS only?

I use a footpod with settings to use "Speed: Always" and "Distance: Indoor".
I interpret this to mean that the "Pace" field will be direct from the footpod.
When outdoors with GPS, it's unclear to me whether fields such as "Lap Pace" and "Average Pace" are direct averages of the footpod pace over the period, or if these are actually derived from GPS only (i.e, time/distance[gps] ).
Anybody know?
Thanks!