Here is something I did not know:
Q. We will be using a special 1 by 1 callsign for Field Day. Is there anything special we must do?
A. Yes, at least once per hour each station using the special call must also ID with the FCC-issued station call. (97.119(d)). For more information on 1×1 callsigns see http://www.1x1callsigns.org/