On Sunday, May 7, 2017 at 7:35:00 AM UTC-7, Matt Herron Jr. wrote:
I noticed my trace from spot 3 yesterday had altitude included. When did that start happening?

Matt

I think you'll find the data you are looking at is the height of the ground where you flew, which Spot has had inits Web UI forever, maybe you never noticed it before. No spot system transmits altitude data, and the current message format used does not have space for such data.