Protocol — Icd-gps-153

Because the protocol is often associated with military-grade GPS equipment, the full technical document is not always available for direct public download.

Also sent at 1 Hz, this message is essential for high-accuracy time synchronization between the GPS and the connected system.

One of its primary uses is to emulate a SINCGARS (Single Channel Ground and Airborne Radio System) interface connection for SAASM-capable GPS units. icd-gps-153 protocol

At its core, ICD-GPS-153 is an that defines the message format and functional requirements for a digital data interface. It is often referred to as part of the GPS Standard Serial Interface Protocol (GSSIP) suite.

Basic message structures and emulation details are available in commercial manuals from manufacturers like Safran Navigation & Timing. Because the protocol is often associated with military-grade

Devices like the Safran NetClock use ICD-GPS-153 messages to provide 1PPS (pulse-per-second) and time-of-day information to external equipment without requiring a full military-grade receiver for simple time-only tasks.

Unlike common consumer GPS protocols like NMEA-0183, which are human-readable ASCII text, ICD-GPS-153 is frequently used to handle sensitive or critical time and status information between specialized receivers (like or GB-GRAM modules) and host systems. Key Components and Message Types At its core, ICD-GPS-153 is an that defines

To obtain the complete specification (e.g., ICD-GPS-153C), developers often must submit a GPS Technical Library Document Request through the U.S. Coast Guard Navigation Center . ICD-GPS-153 vs. NMEA-0183 ICD-GPS-153 Primary Use Military/Industrial Timing & Emulation Consumer/Marine Navigation Data Format Binary/Structured ASCII (GSSIP) ASCII "Sentences" Common Messages Time Transfer, Current Status $GPGGA, $GPRMC, $GPVTG Accessibility Controlled/Restricted Fully Public Interface Control Documents - GPS.gov