This add-on add something as small as a new sword to a whole new ship to use
Let's start from the ship
New 3 category ship have been added with over 6 Variants as well as bunch of pirate theme mob like pirate, bounty hunter, imperial etc.

Raft

Screenshot with multiple variants

A raft is small but durable ship, it's could only carry 1 person but have a storage ability of 12 slots

Recipe to make:

Rowboat

Screenshot with multiple variants:

Basically an upgraded version of Minecraft base boat carry 2 person no storage ability easier to use

Recipe to make (just replaced it with wood variants you want) 

Frigate ship

A really big ship it's have a storage ability of 27 slots and a very fast speed recommended for long range trip
Screenshot with multiple variants( too big couldn't fit all) 

Recipe to make:(just replaced it with wood variants you want) 

Faction:
 

Currently each faction only have 2 mob more variants with unique attributes coming in next update
Each faction have it own ship they can use to attack their enemy

Bounty hunter
 

A hunter, they will kill any pirate and hostile mob, they are hireable with most cooked food

Imperial
 

An imperial soldier they will kill any pirate on sight and some hostile mob

Pirate 
 

A sea bandit sail over the high seas with their ship and look for any loot they can find

Undead pirate
 

A undead joined the pirate to conquer the seas

Treasure crate

Treasure crate are crate that spawn in the ocean to give you extra loot,within period of time treasure crate will be destroyed automatically dropping the loot on the ocean

Here are the loot

Iron : material such as stone, wood, and mineral from iron to diamond

Gold : drop gold items

Diamond : drop armor rarity from leather to netherite

Emerald : drop emerald items

Weapons

Cutlass
Cutlass sword have 45% more damage than the usual sword you can also dual wield it by putting one in offhand although it's just for cosmetic because you can't really use it in offhand

Iron cutlass 
Durability : 251
Damage point : 10,15
Gold cutlass 
Durability : 33
Damage point : 7,25
Diamond cutlass 
Durability : 1562
Damage point : 11,6
Netherite cutlass 
Durability : 2032
Damage point : 13,05

Recipe:

Paddle:
A small paddle used to make rowboat but also can be used as a weapon
Durability : 347
Damage points : 5

Flintlock pistol
A small pistol used in the pirate era, will accompany you on your pirate journey dropped by the new mob [currently have infinite ammo, will fix it once I know how]
Damage point : 12

Dynamite
A small version of the tnt you can throw
Craftable with tnt
Damage points : 3
Explosion size : 1,5
Recipe to make :

Armor

There is plenty of armor drop by the enemy
Here are they

Pirate outfit
Pirate bandana
Durability : 156
Defense points : 3
Pirate shirt
Durability : 156
Defense points : 5
Pirate pants
Durability : 156
Defense points : 4

Bounty hunter outfit
Bounty hunter hat
Durability : 245
Defense points : 4
Bounty hunter shirt
Durability : 245
Defense points : 6
Bounty hunter pants
Durability : 245
Defense points : 5

Imperial outfit
Imperial hat
Durability : 243
Defense points : 4
Imperial shirt
Durability : 243
Defense points : 6
Imperial pants
Durability : 243
Defense points : 5

Pirate legend outfit
Pirate legend hat
Durability : 347
Defense points : 6
Pirate legend shirt
Durability : 347
Defense points : 8
Pirate legend pants
Durability : 347
Defense points : 7

Pirate captain outfit
Pirate captain hat
Durability : 332
Defense points : 5
Pirate captain shirt
Durability : 332
Defense points : 7
Pirate captain pants
Durability : 332
Defense points : 6

And many more things!!! 

1.5 update (bug fix and improvement)

This update fix few of the bugs but mainly the performance breaking bug, regarding the treasure crate dying in water and making a mess in the ocean and lagging the game but also few improvements with the boat model

Bug fixed
-treasure crate drowning
-cannon recipe doesn't work
Replaced with bow and already tested on multiple device to work
And others smaller bug

Improvement & changes
-All boat model have been improved
The raft sails have been moved more back fixing the issue of the sails blocking view

Added more sails to the Frigate ship giving it a more realistic look to the actual frigate ship and also adding some slightly more visibility by splitting the sails

The paddle boat model also been improved just making the model smoother

-nerfed the treasure crate spawn rate
Due to treasure crate loot is good the spawn rate of them have been reduced, (also for performance purposes)

Skeleton pirate now drop a dead body when killed

New things
-undead mermaids
Once mermaid have been killed by undead mobs (drowned, zombie etc) they will be transformed into undead mermaids which is hostile to the player and villager,

-rum
Give nausea(30 sec) regeneration & strength (45)

Miscellaneous

Just a few things other forgot to mentioned
In order for the armor to work you needed to be at least version 1.17+

Experimental game mode needed

That's all for now thanks for the support and comment so I can improve the add-on more and more