In my experience the error is greatest in the direction of travel - less so at right angles to it.   I suspect the predictor is quite accurate - its the other factors that cause most of the error.

    Steve G8KHW / AJ4XE

Sasha,

I am sure results vary, and depend a lot on the accuracy of the input and how recent the winds aloft data is. Getting the "neck lift" accurate under windy conditions can add a significant error. My experience over only 12 launches is +/- 10% of the total distance traveled.  So, IMHO, the observed error in the prediction is not with the code but with the parametric input.

Happy flight!

Best Regards,

Dennis, N8ERF

On Wed, Mar 15, 2023, 7:06 PM Sasha Tim <sasha.nyc09@...> wrote:

Hey all,

In general, how do the predictions of the CUSF engine (predict.sondehub.org) compare with the actual landing site? I've heard the figure of +- 2 miles. What is your opinion on this?

Still working out a few RTTY transmission bugs with my payload, then hopefully launch this week! Code is here https://github.com/radio-satellites/lab-ses-hab/blob/main/cubesat/main.cpp. If anybody could help figure out why the longitude doesn't always transfer correctly (occasionally, it just skips a digit in the decoder, although the datastring[] is always fine) it'd be wonderful!!!!.

73!

Sasha VE3SVF

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