OtoSphere is a small-sized add-on module for commercial GPS receivers, operating in fleet, maritime and commercial network applications. OtoSphere provides protection against GPS jamming, ensuring continuity of APNT (assurance position navigation timing) uunder GPS challenged conditions. OtoSphere provides CSWaP (Cost, Size, Weight and Power) optimized protection at just 74x47x25mm, weighing only 150g, and with a power consumption of <1W, protects GPS L1 from attacks, no other solution that offers such protection is as small, light, affordable or as easily installed as OtoSphere.