The (Interface Control Document for the GPS Standard Serial Interface Protocol, or GSSIP) is a technical protocol that defines how military-grade Global Positioning System (GPS) receivers communicate with external systems. Unlike the common NMEA-0183 protocol used by commercial devices, ICD-GPS-153 is specifically designed for high-security, mission-critical environments. Core Function and Purpose
. Unlike the common civilian NMEA 0183 protocol, ICD-GPS-153 is designed for the rigorous requirements of military-grade hardware. Purpose and Function icd-gps-153 protocol