A similar entry appears in the Wheel of Time Companion, confirming the information. Other information is also included in the Companion, but we did not use it in the TarValon.Net Library.
The White Spray is a Sea Folk ship. Derah din Selaan Rising Wave is the Sailmistress, and the Windfinder is Taval din Chanai Nine Gulls. It is a soarer; a sleek craft, with two tall masts raked back sharply, spars laid across them squarely, and a small cabin. Rand makes the Bargain on board (ACoS, Ch. 34)