Vault Space

A "Vault" is unlocked at the bank upon reaching the court rank of 8th Knight. You will be issued a bank vault with 3 slots.
It is expanded by +5 when you visit the bank in Calicut.
+5 for South American port permits.
+5 for Panama Canal.
+1 for each court rank.
Finally you can also increase it by +5 with the use of a NC item: Vault Expansion Request.

Changing Nations & Becoming 7 Nation

Table of Contents:

• Changing nations
• Becoming 7 nation
• Going Ottoman

Changing Nations. 

This can be done through NPC that is located in each governing building. eg) Duke Braganza for Portugal, Cardinal Tabera for Spain.

Relationship between countries is shown as below.

Sworn Allies <- Affection <- Trust <- Amity <- Normal -> Distrust -> Alert -> Enmity -> Hostile -> Warring

■ A weaker nation to a stronger nation.1. Requirements:- Sum of fame from three jobs needs to be over 200,000- Should not be doing any quest- Should not be a fugitive- Relationship between nations needs to be better than 'Trust'
2. Penalties- Negative influence on relationship with your original nation- Fame of each job will drop by 50,000, total 150,000.If the fame you own isn't enough, it will just turn to 0.
- Infamousness increased by 5000- ID will be changed to Orange color

■ A strong nation to a weaker nation.1. Requirements:- Sum of fame from three jobs needs to be over 20,000- Should not be doing any quest- Should not be a fugitive- Relationship between nations needs to be better than 'Alert'
2. Penalties- Negative influence on relationship with your original nation.- Fame of each job will drop by 5000, total 15,000.If the fame isn't enough, it will just turn to 0.

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Becoming 7 Nation.

The goal is for you to change to the strongest nation. From there you work your way down after investing in every port that only that specific nation can normally invest in. As you do this you will be granted all the perks of being from that nation and then move on the the next weaker nation.

It is constantly changing so I can't give you the order of the nations ,but here is an example. Currently the Netherlands is very strong. I have not determined if they are stronger than England yet but they are definitely stronger than Spain. I was able to change nations from Dutch to Spanish with a relationship status of Normal. A perk for you none pirate or weak battle types is that you won't go orange as well. Also my fame only went down a little bit instead of a lot.

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Going Ottoman

http://unchartedwaters.wikia.com/wiki/Guide_to_Going_Ottoman

If you have any questions you can contact me in game or comment here.
I don't recall where I collected this information but here it is. been a draft forever.

-Inks