I can check the location of geostationary satellites on in-the-sky.org, but i'll need to get an accurate location in the star map for the flasher.
And in other news, how cool is this... live radiosonde tracking....
https://sondehub.org/#!mt=Mapnik&mz=5&qm=3h&mc=34.12545,-85.62744&f=21038268