Thx for replying. I saw many cruise line's web pages, some of them with employment opp. and others without that. I hope the answer me soon.I deck cadet has to learn what a 1st, 2nd or 3rd officer do. He needs 1 year navigating to achieve his/her merchant marine tittle and one day become a captain(2 or 3 years). Watch out while navigating, manouvring the vessel, cargo plans, docking the ship...... Anyway all of that you could see onboard a ship. If you go to cruise ship ask to see the bridge, you will enjoy.
Thx and take care