The NavGuard 501® SAGE GPS anti-jam system is a five-channel design and provides simultaneous dual frequency (L1 and L2) GPS protection. It has a 3.5 inch diameter FRPA footprint that meets the demands of SWaP-C and is a compact solution for use in GPS contested or denied environments. It can drive multiple GPS devices from a single antenna and provides full functionality to all connected devices. The system is designed for the submarine OE-538B antenna system; is C/A, SAASM, and M-Code compatible; and supports Iridium communications. Control is via RS-232/RS-422, the dual L1/L2 GPS RF outputs have adjustable power levels, and the operating temperature is -40° C to +85° C. The system measures 1.4 x 3 x 5.7 in. and weighs less than 1.65 lb., including the antenna.