[NyxWulf]

I saw this when the Palisade Crest was the farthest point. Now there is a line almost straight down. It's been almost 15 minutes since an update, I hope that wasn't a tragic accident.

Can someone confirm if there is some type of speed descent down from the Palisade Crest?

Update: it rerendered, now it looks like a rendering artifact (I hope).

[AlotOfReading]

Probably just a GPS error. It's not uncommon to see large velocities and position shifts, particularly up in the mountains where multipath issues are common.

[closedcontour]

Yeah, unfortunately this comes with the territory, especially with this Garmin inReach data. We are running in "expedition mode" which gives us updates about every five minutes but still, you will occasionally get badly spurious points. This is in contrast to the GPS track data you see in the activity viewer. That is collected from their watches which tend to not be quite as bad (although they have their issues too).

They are now on a narrow, somewhat technical ridgeline, so a few things will accumulate into some annoying errors:

  - the quality of the digital elevation model (DEM) isn't great in the Sierra Nevada (new data is slated to be captured this year, though!)
  - the overheard imagery is okay (0.6m), but not amazing
  - they will likely be hopping from side to side on the ridge, blocking sky view and making GPS quality decrease and frequency of updates decrease

All of this combines into what you see now: jumpiness, not registering with the ridgeline, and the summit points (where they are manually indicating they are on top) not lining up with the labeled points.