# Presentation: 723782

## Everything YouWanted to KnowAbout GPS and WAASApril 2008

## Everything YouWanted to KnowAbout GPS and WAAS(Unless you are an engineer!)

## Agenda

**Basics of GPS**
- Recent change to AIM, AC 90-100
- RNAV, RNP or not?
**WAAS**
- How it works
- What can it do for me?
- Approaches (LPV, LNAV/VNAV)
- SIDs, STARs, Q-Routes, and T-Routes
**What’s next?**
- Performance-based National Airspace System
**Q&A**

## The Usual Caveats

**Valid for navigation in the US National Airspace System**
**Does not invalidate or change ANYTHING required by your POI or in your OpSpec**
**Does not supersede ANYTHING in your POH/AFM**
**Some equipment requires specific operational mitigations**

## FAA Mission

**Provide the safest, most efficient aerospace system in the world**
***Navigation Services goal***
**Provide safe, cost effective navigation services to meet operational needs of the aviation customer**

## The National Airspace System (NAS)

**20,000 airports***
**750 control facilities**
**4,000 commercial flights per day**
**100,000 commercial passengers per day**
**Plus thousands of Part 91 operations every day**
**Source:  *****FAA Administrator’s Fact Book, January 2008***

## GPS Basics

**Nominal 24 GPS satellites in medium earth orbit**
**Each satellite transmits data message**
**Airborne receiver processes message to determine position/velocity/time**
**Navigation function; either in FMS or in GPS (stand-alone)**
**Linear, not angular**

## Receiver Autonomous Integrity Monitoring (RAIM)

**Calculates your position vs. satellites to determine if sufficient for navigation**
**Considers known satellite outages**
**RAIM check for destination and alternate**
**Required for GPS**

## www.RAIMPrediction.net

## NOTAMS

**GPS outages**
- Usually military
**Satellite outages**
- Used in RAIM prediction

## With Approved GPS, I can:

**File RNAV**
**Fly an LNAV approach**
**Fly an RNP/RNAV approach**
**Fly a GPS approach**
**...****but I can’t file a GPS alternate**

## An RNAV Aircraft Can

_**Substitute**_** RNAV for VOR, ADF or DME that is out of service**
**Use as **_**alternative**_** means of navigation guidance (no requirement to monitor VOR, etc.)**
**Extracted from AIM, Section 1-2-3, ***“Use of RNAV Equipment on Conventional Procedures and Routes”*
- Define “Conventional”

## “Conventional” Is Not RNAV

**Older TSOC-129 boxes**
- Lack sufficient database memory
- May lack ability to provide path guidance (path terminators)
- Suitable for most operations, but not RNAV/RNP
**No restrictions on newer units**
**Information on specific units under “Policies and Guidance” at: **www.faa.gov/about/office_org/headquarters_offices/avs/offices/afs400/afs410

## Fly-By and Fly-Over Waypoints

## Fly-By or Fly-Over – Yes, It Is Important

**Fly-By or Fly-Over – Yes, It Is Important**

## Can I Fly An RNAV Procedure?

**GNS 430**
**GNS 530**
**GNS/CNX 480***

- Yes
- Yes
- No

- Yes
- Yes
- No

- Yes
- Yes
- No

- Yes
- Yes
- Yes

***Unit***

***RNAV ***
***Q/T Routes***

***(Terminal)***
***RNAV 1***

***(ER)***
***RNAV 2***

***Substitution***

**Needs T2 letter of acceptance*

**Answer is in AC 90-100A and online, updated table**

## Regardless Of The System, Remember That

**“****Pilots may not substitute for the navigational aid providing lateral guidance for the final approach.” ***(AIM, pg 1-2-6)*

## Typical Conventional Arrival

## RNAV Arrival

**Not a conventional arrival**
- Computer generated waypoints
- Mix of fly-over and fly-by

## WAAS System

## How WAAS Works

## WAAS Capabilities

**Why WAAS?**
- Enhances en-route navigation performance over GPS alone
- Enhances non-precision approach capability over GPS alone
- Allows WAAS equipped users to fly more than 1,294 published LNAV/VNAV procedures to minimums as low as 300 feet
- Allows WAAS equipped users to fly over 1,051 new LPV procedures
- Can use GPS for an alternate (LNAV only)
**Better than 99.99% availability of system**
- 200’ minimum WAAS specific approaches (LPV)
- 1,051 LPV approaches published, with 300 new expected each year

## With WAAS, I can:

**Skip the RAIM check!**
**Fly an LNAV/VNAV approach**
**Fly an LPV approach**
**Use GPS/WAAS entirely**
**...****and I can file a GPS alternate**
- But using the LNAV minima line

## WAAS

**TSO-C146 “Stand-Alone Airborne Nav Using GPS Augmented by WAAS)**
**TSO-C145 “Airborne Nav Sensors Using GPS Augmented by WAAS”**

## Instrument Approach Update

**NDBs being reduced**
**Limited funding for ILS**
**Expansion of LPVs**
**LPV minimums of 200’**

## Localizer Performance with Vertical Guidance (LPV)

**Flies like an ILS (but better!)**
**Minimums down to 200’**
**Why isn’t it a precision approach?**
**What about the pilot test standards?**

## Charting with LPV Minimum Line

**LPV Minimum Line**

**WAAS Channel Number**

**WAAS Approach ID: W24A**
**W**:  WAAS
**24**: Runway 24
**A**:  1st WAAS Approach
-       To Rwy 24

**Temperature Restriction**
**Does Not Apply to WAAS**
**Equipment**

## LPV Production Schedule

**Currently, 1,051 LPV approaches**
- (as of April 10, 2008)
**Adding 300 this year, 400 in FY08, and 500 in FY09 and beyond**
**On the web: gps.faa.gov**
- Click GPS/WAAS Approaches button at bottom of page

## Standard Instrument Departure

## Here is what’s coming!

## Q-Routes

## T-Routes

## Coming Soon...

**LP approaches - as low as 250” required obstacle clearance (ROC)**
**Helo point in space approaches**

## Why All the Changes?

**Ask anyone who regularly flies into O’Hare, JFK, ATL**
- Capacity
- Safety
- Oh, and money!
**Seen any new airports under construction?**
**Heard about the anticipated number of VLJs?**

## Nav Aid Cost

**VOR**
- Install = $250,000
- 20-year life cycle cost = $1,100,000
**ILS**
- Install = $1,200,000
- 20-year life cycle cost = $2,700,000
**Neither figure considers cost of real estate**

## Where is this leading?

**GPS is biggest change to hit aviation since the jet engine!**
**Drawdown of VORs**
- 50% reduction of VORs projected by 2015
- Remainder (most) VORs to be removed by 2025
**NDBs are already being divested**

## Performance-Based Navigation

**Performance-Based Navigation**

**Complete transition by 2025**
**Consistent with ICAO global vision**
**Operational capability based on GPS and augmentations**
**Enhance safety, capacity, efficiency**
**Reduce costs**

**Notes:**
Performance-based navigation is an end-to-end system of concepts and applications based on performance standards without dependence upon specific technologies or equipment 
It fully utilizes the capabilities of all aircraft navigation equipment to operate safely and efficiently in conjunction with external signals provided by ground or space based systems
FAA approved GPS for operational use over 10 years ago. GPS and its augmentations are key enabling technologies toward implementation of performance based services. They provide this capability in the most cost-effective manner considering the unaffordability of the aging ground based infrastructure
GPS does not have the integrity, availability, or accuracy  required for precision approaches.  This is the main reason FAA has spent over $1B delivering WAAS service and $150M in the development of LAAS.
FAA continues to provide support to DoD to ensure the long-term interests of civil & military aviation are addressed. FAA participates on the acquisition team for the GPS-III Program as evaluators and technical advisors
The FAA continues to support development of ground-based augmentation (GBAS) using the Local Area Augmentation System (LAAS).  The LAAS program continues to work with DoD’s joint precision approach and landing system (JPALS) program to ensure system interoperability and sharing of lessons learned.

## Required Navigational Performance (RNP)

**Major change in technical approach – not sensor specific**
**Complete “system” will be RNP certified**
- Aircraft, nav system, autopilot to provide containment and alerting
**RNP 2 miles en route, 1 mile terminal, 0.3 for approach**

## RNP 0.3 DME/DME NA

## Larry’s Forecast

**Satellite-based navigation**
**More takeoff-direct routing**
**ILS-like accuracy en route throughout the NAS**
**Skeleton framework of VORs as mitigation ****for possible GPS jamming/obstruction**
- Until we work out a jam-proof system

## In The Future, You Will:

**Have to intimately understand the workings of your GPS receiver (to fly IFR)**
- Incredibly capable, but it’s a computer!
**Spend more time as a “systems operator”**
**You will either love it, or hate it, but it’s here to stay!**

## Three Major FAA Planning Documents

**Operational Evolution Plan**
- _[www.faa.gov/programs/OEP](http://www.faa.gov/programs/OEP)_
**Roadmap for Performance Based Navigation**
- _[www.faa.gov/ats/rnp](http://www.faa.gov/ats/rnp)_
**Next Generation Air Transport System **

## The Next Generation Air Transportation System (NextGen) Plan Defines A System That Can Meet Demands For The 21st Century

**Trajectory-Based Operations**
**Performance-Based  **
**Operations and Services**
***Precision Navigation***** **
**Weather Integration**
**Network-Centric **
**Information Sharing**
**Surveillance Services**
**Equivalent Visual Operations**
**Super Density Operations**
**Layered, Adaptive Security**

** ****Capabilities**

**Notes:**
The 108th Congress passed Vision 100 – Century of Aviation Reauthorization Act (PL 108-176).  This created a unique coalition of public and private partnerships (Joint Program Development Office (JPDO)).  The JPDO is the organization responsible for the development of NextGen
NextGen is based on nine core capabilities.  Two capabilities that are important to this group are Precision Navigation (GPS and augmentations) and Surveillance Services (ADS-B)
The JPDO is evaluating plans to modernize GPS to ensure there is consistency with NextGen.
The FAA has worked collaboratively with DoD to define the aviation needs for GPS-III.	
It is understood that any additional requirements that are unique to the civil community beyond the current baseline will be funded by the civil community.  L5 is included in the current baseline.

## Navigation Evolution Customer Council (NECC)

**Council made up of government and industry members **
**Created by Director of Navigation Services to:**
- Implement the navigation evolution roadmap
- Adjudication of roadmap comments
- Develop roadmap updates
- Liaison between policy-makers and the aviation community

**Contact me at:**
- _[Larry.Ctr.Oliver@FAA.GOV](mailto:Larry.Ctr.Oliver@FAA.GOV)_
- (202)-385-4593