Stephen, VK2BLQ, alterted me to SSTV activity on 7.171Mhz. I ran qsstv on Linux and easily had some contacts. Leaving it running means that it gathers images decoded for later view.
Hooked up to the IC-7300 via USB audio worked fine but I'm having trouble with CAT control of transmit - the app runs incredibly slowly for some reason. I had a voice contact with VK3HK who mentioned that he had the same issue.
QSSTV has many modes, the first one in the list is Martin 1 so I used that. Happily the receive software figures out which mode is being used automatically.
Stephen, VK2BLQ keeping warm.