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The ICD-GPS-153 protocol is a specialized serial interface standard primarily used in military and high-precision timing applications to facilitate communication between Global Positioning System (GPS) receivers and external devices. What is ICD-GPS-153?

: The protocol provides a formal method for establishing and controlling the digital interface for DoD standard GPS receivers. Binary Protocol

Monitoring the internal temperature, battery, and hardware status.

Will ICD-GPS-153 become obsolete?
No. The current MGUE (Military GPS User Equipment) Increment 1 and Increment 2 receivers continue to support the ICD-GPS-153 message set for backward compatibility. However, new message types are being added to the ICD to support:

B-286466,B-286466.2 [Protest of Air Force Rejection of ... - GAO