Firstly today, I set off to get hold of a cannon for my ship. This involved taking a long route around an island because Link seems incapable of hopping over a small fence.
With the cannon, I could then reach the north-west map area, although I came across the Ghost Ship and got lost in some fog. So I adjourned to an island in the south-west corner where I hope to find a way to get through the fog. Something about digging where lines between stone tablets cross or something. But I have a spade!