I agree, the seas are very difficult for a loner. Have to get a crew to help out.
I also find that it is very hard to get gold, yet many of the items are pretty expensive.
For example, early in the quests you are asked to sink navy ships. Can't really sink navy ships with your small boat so need at least 300 gold to buy a bigger boat.
But majority of quests and drops barely give 5 gold much less 10.
Now if only I could find a treasure chest full of gold.