Two things need saying before anything else, because this region's label is misleading.
First, neither of these two boats is in Zadar. One is at Brbinj on Dugi Otok, the long island that shields the Zadar archipelago from the open Adriatic; the other is at Pirovac, about 50 kilometres south-east on the mainland and actually closer to Šibenik.
Second, and more important: this is not the Zadar fleet. The great majority of boats chartering out of this part of Croatia — including those at Marina Zadar itself — sit under our Kornati region, which holds 945 of them. If you are looking for a Zadar-based charter, that is the page to read. What is here are two small motor cruisers that fall outside it: 9.8 metres on average, with two cabins, one of them crewed.
That said, the water they are on is excellent and under-appreciated. The Zadar archipelago is a dense scatter of long, narrow islands running parallel to the coast — Ugljan, Pašman, Dugi Otok, Iž — with channels between them that stay flat because the outer islands take the weather. Dugi Otok's seaward side has the cliffs; its inner side has the anchorages. Telašćica, the deep protected bay at the island's southern end with a salt lake above it, is a nature park and one of the best bays in Croatia.
Pirovac sits at the head of a shallow bay with the Pašman channel to the north and the approaches to the Kornati to the south, so from there you are between two cruising grounds.
Croatian rules apply: a recognised sailing certificate plus a VHF operator's certificate for the bareboat. Rates are €1,008 and €6,800, and both boats change over on a Saturday.