The Master Mariners' Guild

Master: Jheldarr "Stormrunner" Boaldegg, First Mariner
Headquarters: Mariners’ Hall, Cedar Street, Dock Ward (D44)
Livery: Red hats with white plumes, red shoulder cloaks Entrance: 25 gp (none refused)
Dues: 10 gp/year
Contact: the Master
This guild consists of all ship captains and merchant fleet owners who are based in, or who often put into, Waterdeep. It represents their interests before the Lord's Court, provides them with piloting training into and around Waterdeep’s harbor, maintains emergency warehouse space (and a "free" dock, that is, the guild pays all docking fees with room for three vessels to load or unload from the guild warehouses), and provides accommodations and a private bar for visiting members at Mariners’ Hall. (Though listed as a guild hall, the main floor of Mariner's Hall has full tavern facilities.)
Ship captains pilot themselves into Waterdeep's harbor, or signal from offshore that they require a guild pilot, by lowering all sails and running a red signal pennant up the mainmast. Aside from the standard city docking fee, such pilots are provided free by the city, but the pilot is always accompanied by a guard patrol, who inspect the ship's crew and cargo on the way into the harbor to ensure that no hostile or illicit activities are being brought into Waterdeep.
This guild has a long-standing, continual rivalry with the Order of Master Shipwrights, but cannot afford to maintain its own ship repair facilities. It does keep emergency stocks of rope and sail that guild members in a hurry can purchase at bargain rates instead of dealing in the city for custom made sails The guild also provides its members with fresh livery upon payment of their annual dues.