kousokusen no noritugi wo kakuninsuru.

高速船 literally means high-speed boat/ship.

In natural English, it is often translated as:

• high-speed ferry
• fast ferry
• express boat

Which English wording is best depends on the real-world context, but in travel situations high-speed ferry is often the most natural.

乗り継ぎ means a transfer, a connection, or continuing a trip by changing from one vehicle to another.

It comes from the verb 乗り継ぐ, which means:

• to ride from one vehicle to another
• to transfer
• to make a connection

So in this sentence, 乗り継ぎ is being used as a noun, not as a finite verb.

Examples of the nuance:

• 電車の乗り継ぎ = a train transfer / train connection
• 飛行機の乗り継ぎ = a flight connection
• 高速船の乗り継ぎ = a ferry connection / transfer involving the high-speed ferry

Here, の links two nouns:

• 高速船 = high-speed ferry
• 乗り継ぎ = connection / transfer

So 高速船の乗り継ぎ means something like:

• the high-speed ferry connection
• the transfer for the high-speed ferry
• connections involving the high-speed ferry

This の is not always best translated as of in English. It often just shows that one noun modifies another.

So rather than thinking only X of Y, it is often better to think:

• Y related to X
• Y for X
• X-type Y

を marks the direct object of the verb 確認する.

So the structure is:

• 高速船の乗り継ぎ = the ferry connection
• を = object marker
• 確認する = to check / confirm

In other words, the thing being checked is the connection.

A very literal breakdown would be:

• Confirm the high-speed ferry connection.

It can mean either, depending on context.

確認する often means:

• to check
• to confirm
• to make sure

In everyday English, check is often the most natural translation in travel-related contexts.

So this sentence could naturally mean:

• Check the high-speed ferry connection.
• Confirm the high-speed ferry transfer details.
• Make sure about the high-speed ferry connection.

The Japanese word often carries the nuance of verifying information carefully.

The dictionary form is very common in Japanese when the sentence is being used as:

• a heading
• a note
• an instruction label
• a manual step
• a checklist item
• a plain-form statement

So this sentence may sound like:

• a to-do item: Check the ferry connection
• a travel guide instruction
• a memo

If you wanted to say it politely in conversation, you might say:

• 高速船の乗り継ぎを確認します。
• 高速船の乗り継ぎを確認してください。

But the plain dictionary form is perfectly normal in lists and written instructions.

Yes, the subject is omitted, which is very normal in Japanese.

Depending on context, this could mean:

• I will check the high-speed ferry connection.
• Please check the high-speed ferry connection.
• Check the high-speed ferry connection.
• We need to check the high-speed ferry connection.

Japanese often leaves out subjects when they are understood from the situation.

So this sentence by itself does not tell you exactly who is doing the checking.

They are similar, but not always identical.

乗り換え

Often means:

• changing from one vehicle to another
• a transfer in general

This is a very common everyday word.

乗り継ぎ

Often emphasizes:

• continuing a journey by transferring
• making a connection between parts of a trip

In many contexts, they can overlap. But 乗り継ぎ can sound a bit more like a connecting leg of travel or a travel connection, while 乗り換え often focuses more simply on switching vehicles.

For travel schedules and routes, 乗り継ぎ is very natural.

By itself, it does not say clearly.

高速船の乗り継ぎ is somewhat broad and can refer to:

• a connection involving the high-speed ferry
• a transfer to the high-speed ferry
• a transfer from the high-speed ferry
• the connection arrangements for that ferry route

The exact direction is usually understood from context, such as a timetable, itinerary, or conversation.

So this phrase is more about the connection related to the high-speed ferry, not about one precisely marked direction.

No, in this sentence it is functioning as a noun.

You can tell because:

• it is followed by を
• it is the thing being confirmed

So the structure is noun + object marker + verb:

• 乗り継ぎを確認する

If it were a verb form, the sentence structure would be different.

Here, 確認する is the main verb, and 乗り継ぎ is its object.

Because 高速船 is not being marked as a destination here. It is simply modifying 乗り継ぎ through の.

Compare:

• 高速船の乗り継ぎ
  = the ferry connection / the transfer related to the high-speed ferry

• 高速船に乗る
  = ride the high-speed ferry

• 高速船に乗り継ぐ
  = transfer onto the high-speed ferry

In your sentence, the focus is not on the action of boarding, but on checking the connection as a travel item.

So の is the natural choice.

It sounds like a short practical sentence you might see in places such as:

• a travel checklist
• an itinerary
• a tour guide note
• a booking procedure
• an instruction manual
• a staff memo

It feels concise and functional, not conversational.

So rather than sounding like a full spoken sentence, it often sounds more like:

• Check the ferry connection
• Confirm the ferry transfer details

That is why the plain form 確認する works well here.