Nuclide Navigator is an interactive program to view, search, and extract gamma-ray, alpha-ray, and beta-ray energies and yields, half-lives, parent/daughter relations, and neutron absorptions from databases. Several different “Master libraries” are included. It can also be used to build application libraries or working libraries in the GammaVision format or the Microsoft Access format. The GammaVision format is used by GammaVision, MAESTRO, AlphaVision, and Renaissance software. The Access format libraries are easily used in Visual Basic or user-written programs.