A three-day geophysical survey was conducted in the Old Town of Otočac. This involved combining magnetic prospection and ground-penetrating radar (GPR) in order to locate buried medieval and early modern structures.
Magnetic surveys covered an area of 4,755 m², while GPR measurements were taken over an area of 3,235 m². Despite modern disturbance, the surveys provided detailed insights. The GPR data revealed major building complexes, deep foundations, a probable castle tower, a well and traces of a church beneath the southern road. Extensive debris layers from earlier fortification phases were also detected.