The GRANADA Factored Correlator Model (FCM) Blockset is a Simulink library that provides a swift, flexible, and realistic way of simulating different signal processing architectures, either of standalone GNSS receivers or multi-system solutions. It is directed to a wide variety of users who require simulation speed as well as to access and control internal receiver signals and model system interactions. The GRANADA FCM Blockset includes a reference generator, numerous GNSS receiver components, and other utilities to be used with the FCM module, allowing a fast and easy setup of a GNSS receiver's tracking loops.