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Bennett Avionics

GNC-420W WAAS IFR GPS / COMM / MFD / Moving Map - 14 or 28 volts

$5,795.00

GNC-420W WAAS IFR GPS / COMM / MFD / Moving Map - 14 or 28 volts

$5,795.00
Condition:
Used
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Product Information
Part Number: P/N: 011-01058-00 - Black faceplate, 14/28 V
Part Number: P/N: 011-01058-10 - Gray faceplate, 14/28 V
Part Number: P/N: 011-01058-40 - Upgraded from GNC-420, black faceplate, 14/28 V
Part Number: P/N: 011-01058-45 - Upgraded from GNC-420, black faceplate, 28 V-only
Part Number: P/N: 011-01058-50 - Upgraded from GNC-420, gray faceplate, 14/28 V
Condition: Serviceable (Certified Used)
Certification: 8130-3
Voltage: 14/28 V (the versions we carry)
Included: 6 Month Warranty
Included: GPS Antenna, Rack, Connector, Existing Database included with Installation Hardware option
Comments: All GNC-420W (WAAS version) units say "GNC-420" on the faceplate. The difference is noted on the data tag, with a different model number and part number, but not on the faceplate.
Comments: This WAAS Receiver is compatible with the European EGNOS and Asian MSAS precision GPS systems.
Comments: Some of our GNC-420 sales are for customers who are replacing another GNC-420. These customers do not need the GPS antenna, mounting rack, connectors, or database, and we do not want to charge them for items they do not need.
Comments: If you do not need these items for a new installation, please choose "No" in response to the "Need Installation Hardware" question for a discount.

Product Description

This radio is the "little brother" to the well-known WAAS-enabled Garmin GNS-430W. It has all the features of the GNS-430W except the VOR/LOC/Glideslope Receiver. In exchange for this trade-off, it is significantly less expensive.

The GNC-420W is a newer and much-improved version of the original GNC-420. There are a number of improvements in the GNC-420W, but the primary ones are WAAS Approach Capability and Terrain Information.

WAAS Approach Capability - WAAS, or Wide Area Augmentation System, is a fundamental improvement to GPS accuracy. By adding a series of ground stations and geostationary satellites, WAAS GPS is typically 5 times more accurate than "regular" GPS. This means that it is now possible to fly a complete "Virtual Glideslope" approach into an airport with no local ground-based navigation aids whatsoever. A GNC-420W makes the following approaches available:

  • LNAV (Lateral Navigation): This is a new name for non-precision GPS approaches as we have known them. Like all non-precision approaches, this has a minimum descent altitude (MDA), based on obstructions and terrain.
  • LNAV/VNAV (Lateral Navigation / Vertical Navigation): This class of approach provides Glideslope vertical guidance with a decision altitude (DA) typically 350 feet AGL.
  • LPV (Localizer Performance with Vertical guidance): This is the most precise of the WAAS GPS approaches, the GPS equivalent of a Cat I ILS approach. It also offers Glideslope vertical guidance, but the DA is lower, typically from 200-250 feet AGL.

There are thousands of FAA-approved LPV WAAS approaches, with more being added regularly. The FAA's stated goal is to have a WAAS approach available for every public runway at least 3,200 feet long. To see if the airports you use offer WAAS capability, please click here for the FAA's information about GPS/WAAS Approaches.

Terrain Information - With the GNC-420W, the terrain database is standard (for improved awareness and safety), and it provides this information with greater resolution and precision than the GNC-420. (It is possible to add terrain information to a GNC-420, but this is an expensive option.)

Other GNC-420W improvements over the GNC-420 include:

  • Faster position calculations and screen updates (5x per second)
  • Improved annunciation
  • Holding patterns
  • Autopilot roll steering
  • Parallel track calculation
  • Dead reckoning (This is a backup if GPS signal is lost)
  • More informative status pages
  • Better, faster communication between dual 400-series / 500-series installations
  • Configuration for GDL-69 / GDL-69A XM Receivers (if installed)
  • Simplified installation paperwork

The Garmin GNC-420W may be used with any of these Indicators (the Garmin units are the official choices):

Additionally, the GNC-420 offers 8.33 kHz COMM tuning and transmits with 10 watts output.

If you have any questions about this item, please click Ask us about the Garmin GNC-420W WAAS IFR GPS / COMM / MFD / Moving Map - 14 or 28 volts to send us an email.

Warranty Information

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