Virtual Reality (VR) is promising not just for the game and entertainment industry, but also for the medical and surgical fields, to develop simulation systems and navigation tools for the intra-operative assistance. Electromagnetic (EM) tracking technology is today widely proposed in the context of computer-assisted medical interventions. In this work we preliminary evaluate whether a three-Dimensional (3D) virtual reality EM navigator could simplify a challenging endovascular procedure, the fenestrated endovascular aneurysm repair (FEVAR), facilitating the collateral arteries cannulation. This paper describes the navigation system and presents results of in-vitro trials which provide preliminary evidence to prove the potentialities of the proposed technology for the specific surgical application.