Description based on the Yale Center for British Art copy, in which the imprint of Pars prima corresponds to Koeman Wag 9B, while the imprint to Pars altera corresponds to Koeman Wag 9A. The central panel of the engraved title for Pars prima lacks the printed slip; instead, the central panel retains text of the 1583 edition. Contents correspond to Wag 9A / 9B.
Pars altera with separate title page: Speculi marini, integram cum Borealis, tum Orientalis Oceani nauigationem ... / auctore Luca Iansenio Avrigario ; interprete Martino Everarto Brugensi ... Antuerpiae : Apud Ioannem Bellerum ad intersigne aquilae aureae, MDXCI.
Pars prima ([6], 36, [92] pages) includes 23 maps, numbered 1-19, XIX, 20-22 in the corresponding letterpress; pars altera ([100] pages) includes 24 maps, numbered 23-46 in the corresponding letterpress.
Relief shown pictorially. Depth shown by soundings.
Maps are printed across facing pages, folded at the inner margin, with letterpress text printed on opposite sides of the same sheets.
Includes a volvelle on page 17: Organum Vranicum, siue, Compassus mobilis astriferus.