# JCSys Reference

> Tactical Data Link and MODAF reference with message catalogues and knowledge tests. (iPhone/iPad app by Graeme Watson.)

- Source: https://appshunter.io/ios/app/jcsys-reference/id584340426 (this page in markdown: same URL + `.md`)
- Developer: [Graeme Watson](https://appshunter.io/developer/574479647)
- Category: Reference
- Price: Free
- Rating: 4.80/5 from 5 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 9 MB
- Languages: American English
- Released: 2012-12-10
- Data updated: 2026-06-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/jcsys-reference/id584340426/reviews.md

## What is JCSys Reference?

A handy Tactical Data Link (TDL) and MODAF Reference application. 
Features include: 
* Link 11 (M Series) message catalogue and descriptions 
* Link 16 (J Series) message catalogue and descriptions 
* Link 16 Network Participation Group (NPG) list 
* Link 22 (FJ Series) message catalogue and descriptions 
* Knowledge Test - test your knowledge of the Message Numbers and names
* MODAF View Reference guide
* Acronym Finder - search our list of common TDL Related acronyms

## Key features

- Link 11 message catalogue
- Link 16 message catalogue
- Link 16 NPG list
- Link 22 message catalogue
- Knowledge test
- MODAF View reference
- Acronym finder

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/jcsys-reference/id584340426/reviews.md

### 5/5 — Great resource

*2025-01-08*

I use this app all the time as a quick reference for J messages and NPGs.

### 5/5 — A TDL fountain of knowledge

*2013-10-02, version 1.2*

Very helpful for referring to messages on L11 and L16. Pity I can't take my iPhone into the bunker!

### 4/5 — Excellent

*2012-12-11*

Please add NPG reference for Link 16. Thanks!

### 5/5 — JCSys TDL App

*2012-12-10, version 1.1*

What an excellent app, just what I have been waiting for. Very professional and very functional, I will certainly be using this app on a daily basis. Thanks very much.

## Frequently asked questions about JCSys Reference

### What is JCSys Reference?

JCSys Reference is a mobile application that serves as a handy reference for Tactical Data Links (TDL) and MODAF. It offers detailed catalogues for various link messages, network participation groups, and an acronym finder.

### What TDLs does JCSys Reference cover?

JCSys Reference covers Link 11 (M Series), Link 16 (J Series), and Link 22 (FJ Series) messages. It provides catalogues and descriptions for each.

### Does JCSys Reference have ads?

No, JCSys Reference does not contain advertisements. It is a completely ad-free application.

### What is the age rating for JCSys Reference?

JCSys Reference has an age rating of 4+, making it suitable for a wide range of users.

### On what devices can I use JCSys Reference?

JCSys Reference is available for iPhone, iPad, and iPod devices.

### How often is JCSys Reference updated?

The latest version of JCSys Reference is 1.5, which was last updated on October 5, 2017. It was originally released on December 10, 2012.

### Can I test my knowledge with JCSys Reference?

Yes, JCSys Reference includes a Knowledge Test feature to help users test their understanding of Message Numbers and their corresponding names.

### What is the user rating for JCSys Reference?

JCSys Reference has an excellent user rating of 4.8 stars, based on 5 ratings.

## Version history (last 4 releases)

### 1.5 — 2017-10-05

This app has been updated by Apple to display the Apple Watch app icon.

Updated for iOS 11

### 1.3 — 2014-11-09

MODAF meta model images
iOS 7 support

### 1.2 — 2013-02-28

MODAF View Reference guide

### 1.1 — 2012-12-09

No release notes.

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## Related topics

[jcsys reference](https://appshunter.io/ios/topics/jcsys-reference)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*