The Sentinel M-Code GPS Receiver from General Dynamics Mission Systems is a Space-Qualified GNSS Receiver that is designed for LEO, GEO, MEO, and HEO applications. It has a DC power consumption of about 9 W for LEO and 8 W for GEO orbits. This radiation-hardened receiver is immune to single-event latch-up and is suitable for velocities up to 16,000 m/s. It has GEO sidelobe acquisition and tracking algorithms that enable continuous PNT availability and a fast acquisition processor that enables rapid cold start capability. It has integrated anti-jam technology and anti-spoof algorithms to enable superior performance in GPS-contested and denied environments. This M-Code receiver has 32 Channels, L1 and L2 signals, and C/A, P(Y), and modernized M-Code, with an optional L2C civil signal. It provides near real-time position, velocity, and time measurements. This GNSS receiver has a mass of 2.5 Kg and measures 180 x 160 x 160 mm.