Boardingkortet viser seilingsnummeret.

Because both nouns are in the definite singular form.

In Norwegian, you usually add the equivalent of the to the end of the noun instead of putting a separate word in front:

• et boardingkort = a boarding pass

• boardingkortet = the boarding pass

• et seilingsnummer = a sailing number
• seilingsnummeret = the sailing number

The ending -et is typical for many neuter nouns.

Norwegian often puts definiteness on the noun itself.

So instead of:

• the boarding pass

Norwegian says:

• boardingkortet

This is one of the biggest differences from English. In many simple sentences, Norwegian does not need a separate article like the before the noun, because the ending already shows it.

Viser is the present tense of å vise, which usually means to show.

So:

• å vise = to show
• viser = shows / is showing

In this sentence:

• Boardingkortet viser seilingsnummeret
  = The boarding pass shows the sailing number

Norwegian present tense is nice and simple because the verb does not change depending on the subject:

• jeg viser
• du viser
• han/hun viser
• vi viser

It stays viser for all persons.

The sentence follows the normal Norwegian main-clause order:

Subject + Verb + Object

• Boardingkortet = subject
• viser = verb
• seilingsnummeret = object

So it matches English quite closely:

• The boarding pass
  • shows
    • the sailing number

That makes this sentence very straightforward.

It literally means the sailing number.

It is built from:

• seiling = sailing / voyage / departure by boat
• nummer = number

Together, seilingsnummer means something like:

• sailing number
• voyage number
• departure number for a ferry or ship journey

The exact best translation depends on context, but the grammar is the same.

It is a normal Norwegian word, but it is clearly influenced by English.

It is commonly used for boarding pass, especially in travel contexts. Norwegian also has many travel-related words that are either borrowed directly from English or strongly shaped by it.

The word breaks down as:

• boarding
• kort = card / pass

So boardingkort is very transparent for an English speaker.

Yes, you could, but the meaning would change slightly.

• Boardingkortet viser seilingsnummeret
  = The boarding pass shows the sailing number
  This sounds like a specific number the listener already knows is relevant.

• Boardingkortet viser seilingsnummer
  = The boarding pass shows a sailing number / shows sailing number information
  This is less specific and sounds a bit less natural in many contexts.

Using the definite form on both nouns often makes sense when talking about a specific ticket and the specific number printed on it.

Both boardingkort and seilingsnummer are neuter nouns.

That is why they use:

• et in the indefinite singular
• -et in the definite singular

So:

• et boardingkort → boardingkortet
• et seilingsnummer → seilingsnummeret

In Norwegian, noun gender matters because it affects articles and endings.

A rough pronunciation guide is:

BOARD-ing-kor-teh VEE-ser SAY-lings-num-meh-reh

A few helpful notes:

• board- in boardingkortet sounds close to English boarding
• kort has a clear t at the end
• viser is pronounced roughly VEE-ser
• seilings- starts with a sound close to say-lings
• nummeret is roughly NUM-meh-reh

The exact pronunciation depends somewhat on dialect, but this approximation is good enough to get started.

Because viser is a finite verb in the present tense, not an infinitive.

Compare:

• å vise = to show
• viser = shows

In a full sentence, Norwegian usually uses the finite verb form:

• Boardingkortet viser seilingsnummeret

If you used å vise, it would no longer be a complete main clause by itself.

Yes. It sounds natural in travel or ferry contexts, especially in written instructions, customer service, or app/interface language.

For example, someone might say it when explaining what information appears on a boarding pass:

• Boardingkortet viser seilingsnummeret.
• The boarding pass shows the sailing number.

It is especially plausible for ferries, ships, or other scheduled sailings.