Aelindil has learned that Galdor, an Elf from the Grey Havens, has come to Rivendell. Although Galdor's master, CĂrdan the Shipwright, did not accompany him in his errand, Galdor himself is known to be a mariner of great repute who might help you to hone your skill.
'It is time you learned more of the ways of the Mariner, ${PLAYER}. In my youth, I spent many years among the Elves of Imladris, and I learned much from them and from their many visitors. An Elf of the Grey Havens named Galdor has come to Imladris, and I am certain that his wisdom would be a great boon to you in your journey as a Mariner. Before such a meeting can be arranged, however, you must be suitably prepared and outfitted!
'To that end, you shall have need of equipment that better reflects your skill as a Mariner and also the good you do for the people of Middle-earth, my friend. It would be my honour to fashion for you a weapon and a fine piece of a jewellery by which to represent your prowess, but I must give to you this cautionary word: these implements and articles will not be easily earned, for I shall task you with a number of trials to collect materials of worth to aid in their creation. Only when you have finished each and every one of my trials shall you receive the rewards I have promised you, for only then shall you prove yourself a Mariner befitting them. Such was the test that was laid before me in my youth, and so too shall it be for you!
'If perhaps you do not understand how each of these materials I shall demand relate to each of the others, then allow me to explain before you ask, my friend. These materials shall serve me two-fold, for some of them shall be put to use in the craft of your weapon and jewellery, and others will prove your worth as a Mariner and as one worthy of such equipment.
'If we are understood, then let us begin.'
Aelindil at Tornhad in the Angle of Mitheithel knows of a legendary mariner who could teach you great lessons, but first you must be suitably outfitted.
Galdor can be found near Elrond's Stables, in Rivendell.
You have fashioned a weapon and piece of jewellery worthy of your skill and reputation as a Mariner. Aelindil has asked you to seek out the Elf, Galdor, in Rivendell, that he might train you in the finer techniques of the Mariner.