The weather between the east coast of Canada (Goose Bay) and Greenland can get downright nasty, and many times when that's the case, the alternate routing over the Greenland Ice Cap (min. FL130) from BIRK to BGSF, then BGSF to CYFB can be a safer (though a less-direct) alternative, plus you're in VHF coverage the pretty much the entire way (I've done that routing several times down at FL100.) From there, you can get fuel (double check the fuel situation though ahead of time) at CYVP, Wabush or Schefferville (don't stay the night in Scheff if you can help it though) as well as Chibougamou or Val D'or depending on your ultimate destination.