I worked out this system for ship-ship combat was hoping for some feedback before I try and use it in a game. TIA 

• Have players choose jobs to be trained at if they have never sailed or jobs they may add their proficiency to if they can describe a good reason for being proficient

Captain:

• Usually not for players but can be
• Can veto the maneuvers of the Quartermaster by using an intelligence check with a dc of my choosing (to outsmart the Quartermaster so to speak)
• If NPC take advantage on roll to outsmart player Quartermaster
• If PLAYER only give advantage for good description or reason for vetoing the maneuver

Quartermaster:

chooses how to use the boats movement to position cannons

• Use a nature or survival check with a dc of my choosing
• With success on save half of the ships weapons will be able to attack
• With a failed check half the ships weapons will not be able to attack
• On critical 20 can fire half the weapons with advantage
• Decides who boards enemy vessels and what loot to keep

Helmsman/Sailing Master

• Controls the movements commanded by the Quartermaster or Captain
• Using athletics check with dc of my choosing to keep hold of the wheel while maneuvering
• If successful check half of the ships weapons can attack
• If failed check half the ships weapons cannot fire
• On a critical 20 can fire half the weapons with advantage

Gunner:

• responsible for firing the weapons
• Can have multiple gunners firing the different weapons if you have more than 4 players
• Given advantage on half weapons with critical 20 rolls by Quartermaster or Helmsman

Carpenter:

• responsible for repairing the damage during battle or from the environment
• Use an athletics check to push the boards up against the water rushing in the holes
• Use a dexterity check to nail and tar the patch in place
• Restore HP based on how well the dexterity check was
• Cannot make dex check without passing athletics
• Make athletics check easy as the job has 2 opportunities to fail
• Can have multiple carpenters if more than 4 players