This is the reference to the final scene of the 1st book, "The Gunslinger". The storyline of the book is the Gunslinger's insistent chase for a mysterious Man-in-Black. At the end of the book Roland finds the Man in Black, and they talk about Roland's future and destiny. During the talk the Man in Black uses his magical Tarot deck for the divination and draw three cards, including `Sailor'.

The picture of the card is a sailor with an evil monkey sitting on his shoulder. This image signifies a dark half of a man and predicts that Roland is to meet a man who is under a curse of evil habit. Later in this 2nd book, "Drawing of the three", you will learn that it is a young man addicted to heroin.

Also, please note the play of words in the title of the 2nd book.
"Drawing" is a cardgame term, it means taking a card out of a deck.
In the book, Roland has to "draw" three persons from our world to his own world through some magical doors, and then to teach them, so that they also become gunslingers and help Roland in his quest.

So, Stephen King invented `Sailor' card. It's not a card of the traditional Tarot deck, but the world of Roland is a bit different from our own. Many things are the same, but many are very different.
The symbolism of the card is a dark half of a person. The drug addict is quite a nice guy, but he will have a hard time to give up with his habit -- in other words, to throw off his shoulder that dominating monkey.

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Note added at 17 hrs 48 mins (2005-04-07 05:49:55 GMT)
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Also, about Tarot itself. This is a special \"esoteric\" deck of cards whish is used for fortune-telling and mystical contemplation. There are many types of Tarot, with a different symbolism, but a typical deck consists of two types of cards -- so called Major and Minor Arcana.

Major Arcana are 22 cards which do not belong to any suit. They have their own, special names like `The World\', `Wheel of Fortune\', `Death\', `Lovers\', `Hanging Man\', `Fool\', etc.

Other 54 cards are close to usual playing cards (2, 3,... 10, then Page, Queen, Knight, King and Ace). The names of 4 suits are also different from usual playing-cards. In the most Tarot decks, suits are named Wands, Cups, Pentacles (Coins), and Swords.

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Note added at 20 hrs 6 mins (2005-04-07 08:07:39 GMT)
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I;ve checked the text of the book once more and found that I confused \"The Sailor\" with \"The Prisoner\" -- sorry! The `Sailor\' cards refers to another key character of the book -- a boy by name Jake, while what I had described above is a card referencing to Eddie Dean. The third card (also invented by King, `Lady of Shadows\' is Detta Walker/Odetta Holmes (a woman with a split personality).

Here is the exact fragment from the 1st book, `The Gunslinger\'. The conversation of Roland and the magician (the man in black):

...
“I’m going to tell your future, Roland. Seven cards must be turned, one at a time, and placed in conjunction with the others. I’ve not done this for over three hundred years. And I suspect I’ve never read one quite like yours.” The mocking note was creeping in again, like a Kuvian night-soldier with a killing knife gripped in one hand. “You are the world’s last adventurer. The last crusader. How that must please you, Roland! Yet you have no idea how close you stand to the Tower now, how close in time. Worlds turn about your head.”
“Read my fortune then,” he said harshly.
The first card was turned.
“The Hanged Man,” the man in black said. The darkness had given him back his hood. “Yet here, in conjunction with nothing else, it signifies strength and not death. You, gunslinger, are the Hanged Man, plodding ever onward toward your goal over all the pits of Hades. You have already dropped one co-traveler into the pit, have you not?”
He turned the second card. “The Sailor. Note the clear brow, the hairless cheeks, the wounded eyes. He drowns, gunslinger, and no one throws out the line. The boy Jake.”
The gunslinger winced, said nothing.
The third card was turned. A baboon stood grinningly
astride a young man’s shoulder. The young man’s face was turned up, a grimace of stylized dread and horror on his features. Looking more closely, the gunslinger saw the ba boon held a whip.
“The Prisoner,” the man in black said. The fire cast uneasy, flickering shadows over the face of the ridden man, making it seem to move and writhe in wordless terror. The gunslinger flicked his eyes away.
“A trifle upsetting, isn’t he?” The man in black said, and seemed on the verge of sniggering.
He turned the fourth card. A woman with a shawl over her head sat spinning at a wheel. To the gunslinger’s dazed eyes, she appeared to be smiling craftily and sobbing at the same time.
“The Lady of Shadows,” the man in black remarked. “Does she look two-faced to you, gunslinger? She is. A veritable Janus.”
....

By the way, you may find and read the entire 1st book at the site:

http://www.fictionbook.ru/author/king_stephen/dark_tower_1_g...

It will be extremely important for you if you are to translate `Drawing of the Three\'.