User:Www2/Sim424
Introduction
Current flightgear use a outdate navigation database. This is not bad due to the license. The other side of the coin is that we are frozen in time (around September/October 2013) with the navigation database.
A other problem is that that we have no SID, STAR and arrival procedure that is connect to the navaids database. The rest of the documents describe my view and roadmap to improve this.
Project
Project sim424
The first part of this project is creating a new database format base on sqlite. The dataset is split in five parts: GPL, Navigraph(as a replasment of the GPL database, Community, add-ons scenery, and user datasets:
GPL dataset The classic database is the current navigation database that we using in flightgear convert to the new format.
- Navigraph dataset
This is a optional database with the data source from navigraph that add things as SID, STAR, airways (e.g. trans alantic Concorde Routes), on route ATC and more. This is release as a optional dataset that the user need to download from the site or as a optional package from the Linux distribution.
- Community add-on dataset
The community database is the a add-on database for Navigraph or GPL datasets to add data for close airports (Berlin Tempelhof Airport,
Meigs Field and Kai Tak Hong Kong (This one is include navigraph)) and navigation as Concorde Tracks and provide data for older navigation systems as Low-frequency radio range[1] and LORAN.
- Add-ons
This are patches that makes of add-ons scenery's can make to the datasets describe here above as fixing or adding navaids and airport to the database.
- User
This is use for holdings and fix that are create by the user. [img database design] The plan improvements that i have for sim424 and the xp10 database that we current use is that we get support for example support for Airspace and Air Traffic Control areas outside airport airspace. And more data to simulate navigation beacons more accurate than the current model(see also Next Navigation and Virtual Ether).
The Next navigation project is the to refactor the navigation subsysteems and include new navigation modes as fully simulate global navigation satellite system (GNSS) as GOS/Navstar and Glonass systems and older systems like Omega, LORAN and Low-frequency radio range.
Virtual Ether
Virtual Ether project is a continue of the Next Navigation project with the focuse to crate mathematical models for simulate radio transmission and audio artifacts. This is spesial for simulate voice commulication over HF freqentions.
Road Map
Project Sim424
Database specification 
Tools 
Non-directional beacons
VHF omnidirectional range/TACAN
ILS
MLS
GPS
GBAS/GLS