dragonfly 7 pro - gpx file

Question -

On my most recent track, I show 88 sm on the track screen. When I export the gpx file to a third party application or gpx mapping site, they show around 90.1 -90.2 sm.

I'm on the most recent software update (v12.10).

Dragonfly 7 Pro : 6798 pts / 88.0 sm
GPS Analyzer: 6798 pts / 90.11 sm
JavaWa GPS: 6798 pts / 90.18 sm

I can see some difference based on how many decimals someone uses in their calculations, but ~2% seems a bit high.

Any thoughts on the difference?

-E