MotionBased Elevation

I was just looking at the Walker Ranch profile on Motion Based and was checking out their MB Gravity option which uses Earth elevation maps to estimate elevation changes instead of using unit elevation. They claim that their elevation model is better than GPS elevation but worse than barometric adjusted elevation.

That would explain my results, since the official elevation change at Walker is 1720ft and my Edge 705 shows 1688ft. The "MB Gravity" shows over 2000ft for the same track.