I'm new to DnD and have a question about proficiency

I'm new to DnD and have a question about proficiency.

So let's say that a character has "proficiency" in ship navigation according to their background.

Now obviously there is no actual skill related to ship navigation and there also isn't a weapon that benefits from it.

How exactly do you handle background proficiency that doesn't actually relate to any of the skills that you roll a dice on?

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I know that facial expression! thats incase isn't it?

Background Skills
Profession(Sailor.)

Well, that's Pathfinder. What edition are you?

You can always make up something like a Ship Navigation(Intelligence) check if you need to use it. I used intelligence since I think it's a knowledge skill, but I suppose you could use wisdom too if you thought it was more about intuition, or whatever other stat you thought it fit under.

But usually the tool/game/whatever proficiencies don't come up all that often. You're lucky if you get some use out of an extra language.

What edition?
Because in 3.5 there's actually a book that covers sea adventures, but the basic answer to your question is:
Profession (Sailor)

no, it's 5th edition DnD.

My question is that if the background of a character gives him proficiency with vehicles how it relates to skills. Doesn't need to be a vehicle, just anything that doesn't translate to the skill-chart.

You need proficiency simply to make skill checks in that area.

Most obvious is Thieves' Tools. You can't just jam them in a lock and fumble around until it clicks open, you need proficiency in order to make lockpicking checks.

I think you ask them to roll whatever stat seems relevant and they also get to add their prof. bonus

okay so what skill would relate best to ship navigation?

Or for instance, proficiency with the Healers' Kit lets you use it to stabilize people. Proficiency with alchemy sets or brewing tools lets you craft shit during downtime.