Uansett om sjøgangen er sterk eller rolig, går bilfergen i kveld.

Uansett om means regardless of whether or whether or not.

In this sentence, it introduces a condition that does not affect the result:

• Uansett om sjøgangen er sterk eller rolig = Regardless of whether the sea is rough or calm

It is a very useful pattern in Norwegian:

• Uansett om det regner, går vi ut.
  Whether or not it rains, we’re going out.

So here, the ferry is going tonight no matter what the sea conditions are.

Because sjøgangen is the definite singular form of sjøgang.

• sjøgang = sea motion / swell / sea conditions
• sjøgangen = the sea motion / the sea conditions

Norwegian often uses the definite form where English might use a more general expression. In this sentence, sjøgangen refers to the sea conditions in the relevant situation.

The ending -en marks masculine definite singular:

• en sjøgang = a sea state / sea motion
• sjøgangen = the sea state / the sea motion

Sjøgang refers to the movement of the sea, especially how rough or calm it is. Depending on context, it can be translated as:

• sea conditions
• swell
• rough sea
• movement of the water

In this sentence, sea conditions is often the most natural explanation.

So sjøgangen er sterk eller rolig means that the sea is either rough/strong or calm.

Because they are predicate adjectives after the verb er.

In Norwegian, adjectives used after to be usually stay in their basic form when the noun is singular:

• Sjøgangen er sterk.
• Sjøgangen er rolig.

Compare that with adjectives placed directly before a noun, where agreement is more visible:

• en sterk vind = a strong wind
• et sterkt lys = a strong light

Here, since sterk and rolig come after er, they are predicate adjectives, so their form is normal and expected.

This is because of the V2 rule in Norwegian.

Norwegian main clauses usually put the finite verb in the second position. The sentence begins with the fronted element:

• Uansett om sjøgangen er sterk eller rolig

That whole part takes the first position. So in the main clause, the verb must come next:

• går bilfergen i kveld

Not:

• bilfergen går i kveld

If the sentence started directly with the subject, then bilfergen går i kveld would be normal. But after an opening clause like this, inversion happens:

• I kveld går bilfergen.
• Hvis det regner, går vi hjem.
• Uansett om sjøgangen er sterk eller rolig, går bilfergen i kveld.

Not here. Går is the present tense of gå, which often means go or walk, but it is also used in many extended meanings.

With transport, schedules, services, or events, går can mean things like:

• runs
• operates
• goes
• is running

So here:

• bilfergen går i kveld

means the car ferry is operating / is going / is running tonight, not that it is physically walking.

This is very common in Norwegian:

• Toget går klokka åtte. = The train leaves at eight.
• Bussen går ikke på søndager. = The bus doesn’t run on Sundays.

Because Norwegian often uses the present tense for future events, especially when the event is scheduled, planned, or certain.

So:

• Bilfergen går i kveld
  means
• The car ferry is going tonight / will go tonight

This is very similar to English:

• The train leaves tomorrow
• My flight departs at 6

Norwegian does have ways to mark the future more explicitly, but in ordinary language, the present tense is extremely common for planned events.

Bilfergen means the car ferry.

It is a compound noun:

• bil = car
• ferge = ferry
• bilferge = car ferry
• bilfergen = the car ferry

Compound nouns are very common in Norwegian, and they are usually written as one word. So it is not:

• bil fergen

but:

• bilfergen

The comma separates the opening subordinate clause from the main clause:

• Uansett om sjøgangen er sterk eller rolig,
• går bilfergen i kveld.

This is standard punctuation in Norwegian. The first part sets up the condition or contrast, and the second part gives the main message.

So the comma helps show the structure clearly.

I kveld means tonight or more literally this evening.

In standard modern Bokmål, i kveld is normally written as two words.

Examples:

• Vi sees i kveld. = We’ll see each other tonight.
• Bilfergen går i kveld. = The car ferry goes tonight.

You may sometimes see ikveld, but i kveld is the standard form learners should use.

No, eller means or.

The phrase:

• sterk eller rolig

means:

• rough/strong or calm

The idea is that either possibility is irrelevant: no matter which one is true, the ferry still goes tonight.

So eller is important because it presents alternatives.

Yes, it is normal Norwegian. You should not translate it too literally word for word.

• sterk sjøgang is a natural way to describe rough sea conditions
• rolig sjøgang means calm sea conditions

Languages often combine words differently. Even if strong sea motion sounds strange in English, sterk sjøgang is perfectly idiomatic in Norwegian.

In natural English, you would usually say something like:

• rough seas
• heavy swell
• calm seas

It is the same spelling, but here it has a different function.

Om can mean several things in Norwegian, including:

• about
• if / whether
• in (with time expressions, in some contexts)

In uansett om, it means whether.

So:

• uansett om = regardless of whether

This is very common in Norwegian: one word can have multiple related uses depending on context.

Yes, absolutely. This sentence is a very useful model.

Pattern:

• Uansett om + clause, + verb + subject + rest

Examples:

• Uansett om det regner eller snør, drar vi.
  Regardless of whether it rains or snows, we’re leaving.

• Uansett om han kommer eller ikke, starter vi møtet.
  Whether or not he comes, we’re starting the meeting.

• Uansett om maten er dyr eller billig, vil jeg prøve den.
  Whether the food is expensive or cheap, I want to try it.

This is a great pattern to learn because it combines useful vocabulary with very typical Norwegian word order.