A list of VOLMET schedules can be found here: https://dxinfocentre.com/volmet-wx.htm
This is my decoding of the pictures of SWRadiogram.net Broadcast #187, with my RSP1a and Dipole antenna in Southeastern, VA USA. This broadcast was Sunday 1/17/2021 at 2330UTC on 7780khz from WRMI:
While I was casually skimming the bands for anything especially noticeable, I stumbled upon this flight traffic. When aircraft get too far away for the use of VHF on their route to their destination, they can switch to HF. This is flight info and status of 1 or 2 flights. Just another reason why HF is still needed these days! The broadcasts you see directly down from the voice traffic was actually %100 digital. It is actually fully automated software that talks to other aircraft and shares information.
Anyone know what or where this could be?
MFSK-64 decode of Shortwave Radiogram