Garmin GNC420W GPS Receiver User Manual


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11. OBS Operation
SUSPaftercancelingOBSwhenonFromsideofOBS
path–Thechangeinbehavioristhis:Whenyouputthe
400W/500W-seriesunitintoOBSmodeandthecourse
selectedplacestheaircraftontothefromsideandthen
youcancelOBS,theOBScourseisretainedbuttheunit
indicatesthatsequencingissuspendedbyannunciating
SUSP.Notethatyoucanstillchangethecoursetothe
OBSwaypointaslongasyouhaven’tcancelledOBS,but
onceyouhaveitwillannunciateSUSP.TheWAASTSO
requirestheunittoannunciatewhenlegsequencingis
suspended,sothisisthereasontheSUSPannunciation
isactive.Theclassicproductbehavedthesamewaybut
didnotindicatethatsequencingwassuspendedand
whenpressingtheOBSkey,itwouldreturntoOBS
modeonthesamewaypoint.Withthe400W/500W-se-
riesunit,pressingtheOBSkeywhentheSUSPan-
nunciationisaboveitwillallowlegsequencingtooccur
immediately.
See the Q & A comments about using the OBS key in
Appendix C - Troubleshooting Q&A of the Pilot’s Guide for
more details.
12. Hold to Altitude
TheHoldtoAltitudelegsnowusebaro-corrected
altitudeifitisavailable(similartoFixtoAltitudelegs).
Thismeansthatifbaro-correctedaltitudeisavailable
andtherequiredaltitudeisreachedforthehold,the
400W/500W-seriesunitwillautomaticallyunsuspend
andthensequencetothenextlegaftertheholdxis
crossed.Ifbaro-correctedaltitudeisnotavailable,then
thebehavioristhesameastheClassic–theuserneeds
topressOBStosequencepastthehold.
See the section on Flying an Approach with a Hold in the
Procedures chapter of the Pilot’s Guide for more details.
13. Parallel Track
ParallelTrackallowsyoutocreateaparallelcourse
offsetof1to99NMtotheleftorrightofyourcurrent
ightplan.Aftersettingaparalleltracktoyourcurrent
ightplan,amagentaparalleltrackactiveleglinewillbe
drawnoffsetfromtheoriginalbytheselecteddistance.
Theoriginalcourselinewillappearinwhite.Theaircraft
willnavigatetotheparalleltrackcourseline.
PointstorememberwithParallelTrack:
1. Youmusthaveanactiveightplan.
2. Thecurrentlegmustsupportparalleltrack.
3. Paralleltrackisnotallowedfortheactivelegofan
approach.
4. Paralleltrackisnotallowediftheactivelegisnota
track-to-xordirect-to-xleg.
5. Paralleltrackmaybeallowedbutnottheselectedoffset
distance.
6. ParallelTrackoffsetwaypointisindicatedwitha“-p”
sufx.
Navigating Along A Parallel Track
After setting a parallel track to your current flight plan, a
magenta parallel track line will be drawn offset from the
original by the selected distance. The original course line
will be drawn in white. The aircraft will navigate to the
parallel track course line.
Original flight
plan course
line
Parallel Track offset waypoint
Present
Position
Original waypoint
See the section on Parallel Track in the Flight Plan chap-
ter of the Pilot’s Guide for more details.
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