The 400W/500W series of navigators with WAAS now offer many enhancements over the previous non-WAAS
models. Advancements include new WAAS-enabled GPS antenna, receiver, and associated software. The 400W/500W
series system complies with WAAS TSO C146a and also includes a significant hardware upgrade with a new and much
faster micro-processor. A terrain database for terrain awareness is included as a standard feature and now provides
even greater detail. The WAAS GPS receiver now allows you to use the 400W/500W series unit for primary navigation
and use GPS with vertical guidance for LPV, L/VNAV, and LNAV+V approaches. Non-precision approaches are annun-
ciated as LNAV approaches. The Comparison of Features Summary table provides a quick view of the differences and
is followed by a more detailed description of feature changes.
Feature
1
TSO
2
WAAS Capable
3
Approach Annunciations
4
SBAS Selection
5
GPS Position Calculation Rate
6
GPS Software
7
Vectors-To-Final
8
GPS/WAAS-Based Vertical Guid-
ance
9
Holding Patterns
10
Autopilot Roll Steering
11
OBS Operation
12
Hold to Altitude
13
Parallel Track
14
Magnetic Variation Options
Comparison of Features Summary
Classic 400/500
C129a – Supplemental navigation
No
C129a non-precision annuncia-
tions
No
Once per second
Level-C
Yes
No
Yes
Yes
Yes
Yes
No
True, Magnetic, or User
New 400W/500W
WAAS TSO C146a – Primary navigation
Yes
C146a precision annunciations of LPV, L/VNAV,
LNAV+V, LNAV, and MAPR
Yes for WAAS
Five times per second
Level-B. More robust
Auto-Suspend (SUSP) is active for Vectors To Final
(VTF) until on the "TO" side of the FAF and the
aircraft ground track is within a 45° course of the
published in bound course. At this point, the SUSP
annunciation will automatically extinguish.
GPS WAAS provides vertical guidance on the
available GPS approaches
Holding pattern depiction on the Nav mode
moving map shows aircraft position and provides
active guidance
Includes active guidance during holding patterns
and procedure turns
OBS/SUSP behavior around the MAP is different
Hold to Altitude legs will now use baro-corrected
altitude if it is available
Yes
True or Magnetic
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