Balloon Track vs. GPS

I post these charts here to show the close correspondence that the GPS's output for the moment of packet generation matches the calculated value for these parameters from within Balloon Track.

In essence, BT is more of an averaged speed in that it takes two packets separated in time and develops the distance and speed and direction of travel between these two packets.

I've heard some comments that trusting GPS speed values may not be a good idea in that the balloon can be experiencing momentary accelerations that would significantly alter the balloon's predicted path if those momentary speeds were extended into an entire wind layer.

I don't think this presents too much of a problem as you might see from the data below.

You can generate these graphs for yourself by downloading the spreadsheet file or by obtaining the raw telemetry and calculating the values between packets yourself.

I just threw in this time to altitude and ascent rate graph because it's often requested.