Starting on January 1, radio amateurs and clubs with VA-prefix call signs may use CF instead, and those with VE-prefix call signs may use CG instead. Amateurs and clubs with VO-prefix call signs may substitute CH instead, while those holding VY-prefix call signs may substitute CI. Use of the special prefixes is optional, and Canadian radio amateurs may choose if and when to use the special prefix at any time during the year.
VY1AAA, the Yukon Canam Contest Club, will mark the sesquicentennial with special call sign XK150YUKON from January 1 until March 1. The rest of 2017, VY1AAA will operate using either CI1AAA or VY1AAA.