GNSS-A software GNATSS released!

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John B. DeSanto

Dec 7, 2023, 5:16:14 PM12/7/23
Hi All,

I am pleased to announce the open beta release of GNSS-Acoustic Transponder Surveying System, or GNATSS, currently v0.1.0. The code is available at and has documentation (including install/operation instructions, a positioning example, and a theoretical derivation of the technique) at

This is an open-source python rewrite of the software developed by David Chadwell to position GNSS-Acoustic arrays by solving for an array offset that best fits the residuals between observed and modelled two-way travel times between a sea surface platform and seafloor transponders. GNATSS has been tuned to be compatible with the arrays deployed as part of the Near-Trench Community Experiment in offshore Cascadia and Alaska and is benchmarked to provide the same results as the original code used by Chadwell and others in previous experiments in Cascadia, Alaska, and New Zealand.

GNATSS is still in active development and has benefited from significant contributions by researchers and software engineers at the University of Washington Scientific Software Engineering Center and Ocean Networks Canada. If you would like to contribute to the project, you may do so at

If you would like to learn more about GNATSS, I will present a poster (G43B-0487) at AGU next week on Thursday afternoon that will provide an overview of the software and its application.

-John DeSanto
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