When writing do you underline the name of a ship?

Here's why:

* Italicization is the standard convention for emphasizing words, including names of ships, books, movies, etc.

* Underlining was a common practice in typewritten documents before the widespread use of computers and word processors.

So, you would write:

* "The *Titanic* was a British passenger liner."

* "The *USS Enterprise* is a fictional starship."

However, you might find some publications using other conventions. For example, some style guides might suggest using quotation marks. Ultimately, it's important to be consistent within a single piece of writing.