This year it takes just four letters - C S K and M - to let everyone on the air know that they're hearing a CW operator in one of Canada's provinces who's taking part in the Canadian Straight Key Month of the Straight Key Century Club. The event has eliminated the use of special callsigns. Now, hams will be heard calling "CQ C S K M," followed by their own callsigns.

According to the SKCC website, the change was made to make it easier for everyone to enjoy the event, which runs through to the 31st of September. Operators who work at least six different provinces are eligible for a special downloadable award.

The annual event is similar to the SKCC's Straight Key Month featuring US stations. That event, which uses the callsign K3Y, takes place every January.