Garmin GNC420W GPS Receiver User Manual


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5. GPS Position Calculation Rate
TheWAASGPSreceivercalculatesitspositionve
timespersecondratherthanoncepersecondlikethe
ClassicC-129/C-129aGPSsystems.This,togetherwith
theenhancedverticalaccuracyandothersystemen-
hancements,allowsforverticalapproachguidance.
6. GPS Software
TheGPSsoftwareoftheClassic400/500seriesmet
therequirementsforLevel-C.Thenew400W/500W
meetsthemorerigorousrequirementsofLevel-B,where
required.
7. Vectors-To-Final
IfVectorstoFinalisactivatedwhileonthe“FROM”
sideoftheFAF,automaticwaypointsequencingissus-
pendedandtheSUSPannunciationwillappear.Auto-
maticwaypointsequencingwillresumeoncetheaircraft
isonthe“TO”sideoftheFAFandwithinfull-scale
deection.
Vector-To-Final Suspend Operation
Remember,don’tpresstheOBSkeyoryouwillhave
toreloadtheapproach,unlessyoudesiretosequenceto
thenalapproachsegmentintheactiveightplan.
See the section on Vectors to Final in the Procedures chap-
ter of the Pilot’s Guide for more details.
8. GPS/WAAS-Based Vertical Guidance
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.
9. Holding Patterns
TheHoldingpatterndepictionontheNavmode
movingmapshowstheaircraftpositionandprovides
activeguidance,withrollsteeringautopilot-equipped
aircraft.
Guidance provided along the holding pattern
See the section on Flying an Approach with a Hold in the
Procedures chapter of the Pilot’s Guide for more details.
10. Autopilot Roll Steering
Rollsteeringguidanceisnowprovidedforprocedure
turnsandholdingpatterns.Theholdingpatternnowde-
pictstheactuallocationandshapeoftheholdingpattern
whileprovidingreal-timedisplayofyourposition.
See the Procedures chapter of the Pilot’s Guide for more
details.
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