some "trick" about the fleets and exploration

my own thoutgh is that Prizon Merchant ship is really a very good ship if you want to increase money trough trading and if you don't have explored other part of the map.

Vasco De Gama ship is for now the most interesting ship I ever used.
very fast high spaces and can sail for 12000 miles.
for exemple is very very usefull if you have to move goods from Europe to America.
Donno how many ports have you all descovered, but if you can.... put 1 pleet as explorer and go to find as more ports you can