Sikkerhetsinformasjonen viser mønstringsstasjonen.

Because Norwegian normally writes compound nouns as a single word. English often uses separate words, but Norwegian usually joins them.

So sikkerhetsinformasjonen is built from: sikkerhet + informasjon + the definite ending -en

That is very normal in Norwegian. If you split it into separate words, it usually looks wrong.

That -s- is a linking sound used in many Norwegian compounds. It does not mean plural, and it does not show possession.

So: sikkerhet + informasjon → sikkerhetsinformasjon

You just have to learn that many compounds use this linking s, while others do not.

For the same reason: it is a compound noun. Norwegian prefers to combine the parts into one written word.

It can be understood as: mønstring + linking -s- + stasjon + definite -en

So the final form becomes mønstringsstasjonen.

Because the compound structure puts an extra s right before a word that already starts with s.

So you get: mønstring + s + stasjon

That creates ...ss... in the middle. It may look strange at first, but this kind of spelling is normal in Norwegian compounds.

Here -en marks the definite singular. In English, that usually corresponds to the.

So: informasjonen = the information
stasjonen = the station

Norwegian often adds definiteness directly to the noun instead of using a separate word like the.

Because the last nouns in these compounds, informasjon and stasjon, are treated as common-gender nouns in Bokmål. Common-gender nouns usually take -en in the definite singular.

A useful rule is this: in a compound noun, the last part decides the gender and the ending.

So:

• sikkerhetsinformasjon follows informasjon
• mønstringsstasjon follows stasjon

That is why both end in -en here.

Viser is the present tense of å vise.

It can mean shows, indicates, or displays, depending on context.

One helpful thing for English speakers: Norwegian verbs do not change for person in the present tense. So you get the same form with different subjects:

• jeg viser
• du viser
• den viser

Because Norwegian does not always need a separate definite word. In a simple noun phrase without an adjective, the ending on the noun is usually enough.

So:

• stasjonen already means the station
• informasjonen already means the information

A separate word such as den is more likely when an adjective is included, for example: den store stasjonen = the big station

But in your sentence, no adjective is present, so the noun ending alone is enough.

This sentence uses the basic Norwegian main-clause order:

subject + verb + object

So:

• Sikkerhetsinformasjonen = subject
• viser = verb
• mønstringsstasjonen = object

That looks very similar to English here. The broader rule in Norwegian is that the finite verb usually comes in second position in main clauses, but in this simple sentence that gives an English-like order.