If that's the case you WANT the bug that makes your boat end up where the Greenwich line crosses the Equator...:rotfl:
And even then you'll never make it.... A IIa boat has just enough to get home, perhaps the grid is CD61? that should be doable, but still not for a canoe, in that case, refuel in the canaries, vigo or cadiz, or if France has already fallen, Lorient or st. Nazaire