Garmin GNC420W GPS Receiver User Manual


  Open as PDF
of 12
 
1
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signicant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.
Comparison of Features Summary
Feature Classic 400/500 New 400W/500W
1 TSO C129a – Supplemental navigation WAAS TSO C146a – Primary navigation
2 WAAS Capable No Yes
3 Approach Annunciations C129a non-precision annuncia-
tions
C146a precision annunciations of LPV, L/VNAV,
LNAV+V, LNAV, and MAPR
4 SBAS Selection No Yes for WAAS
5 GPS Position Calculation Rate Once per second Five times per second
6 GPS Software Level-C Level-B. More robust
7 Vectors-To-Final Yes New Auto-Suspend logic; see page 5 for details.
8 GPS/WAAS-Based Vertical Guid-
ance
No GPS WAAS provides vertical guidance on the
available GPS approaches
9 Holding Patterns Yes Holding pattern depiction on the Nav mode
moving map shows aircraft position and provides
active guidance
10 Autopilot Roll Steering Yes Includes active guidance during holding patterns
and procedure turns
11 OBS Operation Yes OBS/SUSP behavior around the MAP is different
12 Hold to Altitude Yes Hold to Altitude legs will now use baro-corrected
altitude if it is available
13 Parallel Track No Yes
14 Magnetic Variation Options True, Magnetic, or User True or Magnetic
15 Terrain Database Optional Standard. Increased resolution.
16 Dead Reckoning (DR) No Yes
17 Satellite Status Page Yes Enhanced with new colors and 3D differential fix
notation.
 previous next