At least three different QSOs going on around 6.8 MHz 6800 kHz - at 2211 one of the stronger groups switched from 6800 kHz LSB to 6800 kHz USB and continued chatting. 6798 USB is suffering from QRM from another nearby SSB QSO that's a bit weaker. 6800 USB is the strongest at 2213 UTC. All in Spanish, considering how quickly they switched from LSB to USB mode, I'd venture to guess that these are freebanders and not part of a fixed radiotelephone network....that, or, they're fishing boats / pescadores of course. Not sticking around to find out more due to the crazy amount of QRM and lots of other listening targets at the moment.