I have no interest in the various "contest modes" that don't allow a QSO. I did SITOR/AMTOR back in the day and kind of miss it. I found to be a very fun mode to work. The ARQ mode was really something with the old PK-232 lighting up like a disco Sailors back in the day were connecting to commercial SITOR stations with ham gear often enough that the operators at WLO would tell you the correct offsets for common ham gear if you asked, the maritime convention was different and you would be off frequency if you used the published numbers. WLO has moved on to PACTOR now, not sure how much AMTOR/SITOR is even left except for all the NAVTEX stations.