This radio is the "little brother" to the well-known Garmin GNS-430. It has all the features of the GNS-430 except the VOR/LOC/Glideslope Receiver. In exchange for this trade-off, it is significantly less expensive. If you do not need this capability at all, or do not need it for a secondary GPS/COMM, the GNC-420 deserves serious consideration.
Additionally, the GNC-420 transmits with 10 watts output. This is twice the power of many GPS/COMM radios.
The GNC-420 contains and integrates the following functions:
- IFR GPS
- Jeppesen database
- Moving Map / MFD
In addition to the color map, the GNC-420 can also display lightning data from a remote WX-500 Stormscope, weather data received via satellite, and traffic from a GTX-330 Mode S transponder.
Garmin also protects the GNC-420 from future obsolescence, with an available WAAS upgrade.