4月1日～5月31日までの間、使用されます。
from OPDX news
CANADIAN SPECIAL EVENT CALLSIGNS. To celebrate 50th anniversary of the
opening of the St. Lawrence Seaway, look for Canadian amateurs to use the
following prefix between April 1st and May 31st:
XL -> VA XN -> VO
XM -> VE XO -> VY
from OPDX news
CANADIAN SPECIAL EVENT CALLSIGNS. To celebrate 50th anniversary of the
opening of the St. Lawrence Seaway, look for Canadian amateurs to use the
following prefix between April 1st and May 31st:
XL -> VA XN -> VO
XM -> VE XO -> VY
