Until now I only found three different missions in Port Royale 3 that start at the sea.

Who

Castaway, compare map

Where

at sea

Objective

bring the castaway back to its home town, or at least any other town

Reward

Gold: 5.000 als Bootsmann, 100.000 Herrscher der See

Hint

– bringing the castaway back to its home town will give you a higher reward

– the castaway will leave your convoy in the next town you enter

What

Treasure chest, compare treasure map

Where

at sea

Objective

a treasure chest is floating in the water

Reward

Gold: possible

Goods: possible

What

Bonus treasure, compare bonus treasure map

Where

at sea

Objective

you can find 15 bonus treasure on the map

Reward

Gold: possible

Goods: possible

Sailors: possible

Hint

– the bonus treasures are not linked to the treasure depicted on the treasure maps

– you have to be very close to the locality, elso you won’t find the bonus treasure

– do not use a fully manned convoy as new sailors won’t be able to board

– use a convoy with high cargo capacity; in case you are overloaded, you can not leave the next town your convoy entered which will force you to sell goods

What

Attack pirate convoy

Where

at sea

Objective

attack and sink the pirate convoy

Reward

Gold: possible

Reputation: +2% with all nations

What

Attack pirate hideout

Where

at sea

Objective

attack and destroy the pirate hideout

Reward

Gold: possible

Goods: possible

Reputation: +9% – +10% with all nations