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is-gps-200n

Explains IS-GPS-200 Rev N as a worked interface specification exemplar for ICD authoring.

5|1|Updated Jun 19, 2026
Search Tags:#requirements#configuration management#systems engineering#gps#icd#interface specification#is-gps-200
One-click install
npx skills add https://github.com/jgsystemsconsulting/jgs-se-knowledge-packs --skill is-gps-200n-jgsystemsconsulting
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: is-gps-200n
Source: https://github.com/jgsystemsconsulting/jgs-se-knowledge-packs/tree/main/packs/is-gps-200n
Command: npx skills add https://github.com/jgsystemsconsulting/jgs-se-knowledge-packs --skill is-gps-200n-jgsystemsconsulting

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve? Systems engineers rarely have a real, public interface specification to learn from when writing or reviewing ICDs. This pack turns IS-GPS-200 Rev N (the NAVSTAR GPS Space/User Segment interface spec) into queryable reference notes so you can see how a live IS defines interfaces, controls changes, and organizes normative annexes. ## Core Features & Use Cases - ICD structure exemplar: Six chapters covering definition vs identification, interface criteria patterns, NAV payload families, time/definition hygiene, and appendix mapping. - Change-control reference: Explains the PIRN/ICWG/CCB/IRN paper trail and DIST-A public-release marking as a configuration management model. - Authoring patterns: A patterns file with When/How/Trade-offs guidance for writing your own interface specifications. - Use Case: Ask how a real IS handles reserved bits, CEI data sets, or URA definitions, and get answers grounded in the actual Rev N structure rather than generic advice. ## Quick Start Ask the agent to explain how IS-GPS-200N structures its interface criteria section and which appendix holds the CNAV message definitions.

Frequently Asked Questions about is-gps-200n

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I use IS-GPS-200 as an example for writing an ICD?▼

Use this pack to study how a live interface specification is structured: definition first, then identification, then measurable criteria, with bit-level details pushed to annexes. The patterns.md file distills these into reusable authoring patterns with trade-offs.

What is the difference between IS-GPS-200 and faa-std-025?▼

IS-GPS-200N is a live interface specification exemplar showing what a finished IS looks like, while faa-std-025 teaches how to prepare an IRD/ICD with outlines, VRTM, and configuration management rules. The two packs are complementary, not overlapping.

Does this pack include GPS PRN code tables or CNAV bit fields?▼

No. The pack deliberately excludes Appendix II-IV content such as PRN/Gold-code tables, LNAV/CNAV bit maps, and FEC polynomials. It maps which appendix holds what, so implementers open the official IS for actual decoder work.

Does this pack cover L5 or L1C GPS signals?▼

No. L5 and L1C are specified in IS-GPS-705J and IS-GPS-800J, which are separate documents not included here. This pack covers only the L1/L2 interface defined in IS-GPS-200 Rev N.

What is the CEI data set in GPS navigation messages?▼

CEI is the Clock, Ephemeris, Integrity data set that users must consume as one consistent bundle. Chapter 5 explains issue-of-data rules and why mixing parameters from two CEI sets is an interface defect.

Is IS-GPS-200 Rev N legally redistributable?▼

Yes. It is a US Government work under 17 U.S.C. Section 105 with Distribution Statement A, approved for public release with unlimited distribution. It is public domain and free to reproduce, including commercially.

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