A light is shown from a prominent structure, 15m high, standing on this small islet.
The main passage, 2.5 miles wide, leads S of Hrid Grujica and N of the islets lying off the N end of Otok Premuda.
The passage lying to the N of Otocic Grujica is not recommended except with local knowledge as an unmarked shoal patch, with a depth of 7m, lies nearly in its center.
A shoal patch, with a depth of 15m, lies about 1.7 miles NW of the N extremity of Otok Premuda and should be avoided by deep-draft vessels.
An isolated shoal, with a depth of 9.5m, lies about 1.5 miles SE of Hrid Grujica and can best be avoided by passing about 0.6 mile SE of the islet.