Flight Training - November 2014 - 15

HOW IT WORKS

BY IAN J. TWOMBLY

WAAS

Taking GPS to the next level
THE ADVENT OF GPS has completely changed the way we fly.
It makes point-to-point navigation virtually idiot-proof and
enables an incredible amount of situational awareness. How can
something that's so revolutionary be made even better? With
WAAS, the wide-area augmentation system.
WAAS is a system that improves the accuracy of GPS signals.
As you know, GPS is a system of satellites that communicate their locations to the device installed in your aircraft or
contained within your portable receiver, which then uses that
information to calculate your position. Without WAAS, that
signal is accurate to within anywhere from five to 15 meters-a
major leap forward from ground-based radio navigation.
WAAS
communicating
satellite

By sending the GPS position signal through a series of ground
stations and then back up to dedicated satellites before releasing it to your unit, WAAS greatly improves the standard GPS
position information. In fact, a WAAS-equipped GPS has been
tested to an accuracy of less than a meter.
Such an accurate signal may not matter for most VFR pilots,
but it represents the opportunity for instrument pilots to make
approaches to within 200 feet of the ground without visual
contact.
The system requires no fees, no subscription, and no action on
the part of the user. Simply turn on your WAAS-capable device; it
will connect and zero in on your position automatically.
GPS

WAAS
APPROACHES
The FAA has developed a
number of different types
of WAAS approaches.
One runway may have
the option of an approach
with only lateral guidance,
one with both lateral
and vertical guidance,
and one with something
called LPV, or localizer
performance with vertical
guidance. These LPV
minimums approximate
precision approach
capabilities.

Master
station

ART NOT FINAL

Wide area
reference
station

STEVE KARP

A FUTURE WITH WAAS
WAAS is a key element of Automatic Dependent Surveillance-Broadcast (ADS-B), the backbone of the FAA's future air traffic control
system. Using ADS-B, airplanes transmit their WAAS-enhanced positions to air traffic control, which eventually will use it to replace
traditional long-range radar capabilities. Some owners are already equipping their aircraft with this technology, which, beginning
January 1, 2020, will be required for operations in most airspace where a transponder is required today.

NOVEMBER 2014 FLIGHT TRAINING

/ 15



Flight Training - November 2014

Table of Contents for the Digital Edition of Flight Training - November 2014

Contents
Flight Training - November 2014 - Cover1
Flight Training - November 2014 - Cover2
Flight Training - November 2014 - Contents
Flight Training - November 2014 - 2
Flight Training - November 2014 - 3
Flight Training - November 2014 - 4
Flight Training - November 2014 - 5
Flight Training - November 2014 - 6
Flight Training - November 2014 - 7
Flight Training - November 2014 - 8
Flight Training - November 2014 - 9
Flight Training - November 2014 - 10
Flight Training - November 2014 - 11
Flight Training - November 2014 - 12
Flight Training - November 2014 - 13
Flight Training - November 2014 - 14
Flight Training - November 2014 - 15
Flight Training - November 2014 - 16
Flight Training - November 2014 - 17
Flight Training - November 2014 - 18
Flight Training - November 2014 - 19
Flight Training - November 2014 - 20
Flight Training - November 2014 - 21
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Flight Training - November 2014 - 56
Flight Training - November 2014 - Cover3
Flight Training - November 2014 - Cover4
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