Be aware that Transport Canada is currently insisting (as per regs) on carriage of HF radio through Gander airspace unless you :
1) fly at FL250 or above;
2) avoid Gander airspace by routeing Sondrestrom-Iqaluit, for example;
3) fly VFR while oceanic below FL050, which, though legal, is not recommended.
VHF/Satfone is not enough.
Third-party insurance for a transatlantic trip is also mandatory.