Ragusan sea captains that sailed on the ships of the Republic had to have a document called patente for legal navigation. They also needed a special license (congedo) to navigate beyond the Adriatic Sea, which was usually issued for a period of three and a half years. The consent to extend that permit was called a proroga and was usually issued for a period of six months. In the first volume of this series the records show different prorogas which were issued on the basis of congedos in the period from 1744 to 1807. On the left page of the book, congedos are recorded, and on the right page, prorogas. The format is the following: Antonio Brateglich Capitano del Brighentino nominato S. Catterina ha avuto il primo Congedo per tre anni e sei mesi di rispetto da computarsi dal adi 10 Marzo 1799 (left page); Ad istanza di Reuben Vita Ambonetti adi 27 Giugno 1802 avuta la proroga in iscritto per sei mesi dallo spirare del contranotto primo congedo, cosiche li scorrono li quatro anni (right page; vol. 1, ff. 9v, 10). The second volume of this series contains documents patenti and congedi.

The first volume of this series is important for researching the role of Jews in maritime affairs of the Dubrovnik Republic. Requests for the extension of the permit to sail outside the Adriatic were requested by the co-owners of the ships, among whom there was a large number of Ragusan Jews from different families such as Ambonetti, Costantini, Levi Mandolfo, Maestro, Pardo, Terni, Tolentino.