INTRODUCTION1Model DescriptionsThis guide covers the operation of the GPS 400W,GNC 420W, GNC 420AW, GNS 430W, GNS 430AW.In general, all models will be referred to as the 400W-series, except where there are physical or operationaldifferences. The 400W-series units are 6.25” wide and2.66” high. The display is a 240 by 128 pixel color LCD.The units include two removable data cards, one witha Jeppesen database (inserted in the left-most card slot)and the second being a Terrain database (inserted in theright-most card slot).GPS 400WThe GPS 400W has a WAAS GPS engine and is TSOC146a certified for primary domestic, oceanic, andremote navigation including en route, terminal, andnon-precision approaches, and approaches with verticalguidance, such as LPV and LNAV/VNAV. The GPS 400Wcan simultaneously give aviators vital approach infor-mation and weather and traffic data in relation to theirposition on a color moving map display. Thanks to ahigh-contrast color display, the information can be easilyread from wide viewing angles even in direct sunlight. Itscolor moving map features a built-in database that showscities, highways, railroads, rivers, lakes, coastlines, and acomplete Jeppesen database. The huge Jeppesen database(that can be updated with a front-loading data card)contains all airports, VORs, NDBs, Intersections, FSS,Approach, DPs/STARs, and SUA information.Pilots will enjoy the GPS 400W as an MFD, especiallywhen it is coupled with traffic, lightning detection, andweather interfaces like Ryan TCAD, TIS from the GarminGTX 330 Mode S transponder, or L3 SKYWATCH™, orSTORMSCOPE® WX 500. With the PC-based FDE pre-diction program, the GPS 400W may be used for oceanicor remote operations. For the latest in graphical andtextual weather information, the GPS 400W can connectto XM Satellite Radio’s XM WX Weather Service via theGDL 69/69A datalink receiver.GNC 420W/420AWThe GNS 430W/AW includes all of the features ofthe GPS 400W, and also includes TSO’d airborne VHFcommunications transceiver. This multipurpose unit isavailable with either a 10-watt (GNS 420W) or 16-watt28 V dc (GNS 420AW) COM.GNS 430W/430AWThe GNS 430W/AW includes all of the features of theGPS 420W/420AW, and also includes TSO’d airborneVOR/Localizer and Glideslope receivers. This multipur-pose unit is available with either a 10-watt (GNS 430W)or 16-watt 28 V dc (GNS 430AW) COM.Takeoff TourThis Takeoff Tour is intended to provide a briefintroduction of the 400W-series major features. Therest of this manual describes these features, and others,in additional detail. Use this guide, as needed, to learnor review the details regarding a particular feature. TheIndex may be used to quickly locate the informationyou want. Before flying with your 400W-series unit, takethe time to review the information in the manuals andpractice with the trainer.After you’re familiar with the basics, some suggestedreading within the Reference section includes:• Flight plan features - Section 4• Waypoint information pages (database information)- Section 6• IFR procedures - Section 5• Unit settings (configuring the unit to your prefer-ences) - Section 9If you’re unable to locate the information you need,we’re here to help! Garmin’s Customer Service staff isavailable during normal business hours (U.S. Centraltime zone) at the phone and fax numbers listed on pageii. You can also reach us by mail (see page ii) or at ourweb site address: www.garmin.com.Model Descriptions