GNC 355 is a satellite-navigation receiver that processes GNSS signals to determine position and timing. It supplies navigation information to a host installation, with antenna selection and correction services defined by the required positioning performance.
The Garmin GNC 355 is a panel-mounted GPS navigator with an integrated VHF COM radio, a satellite-navigation receiver for aircraft that need certified position guidance and voice communication in a single two-inch unit. It processes GPS and SBAS signals to produce position and navigation data and presents them on a colour moving map.
The navigation function supports GPS/WAAS navigation under TSO-C146e for en route, terminal, non-precision and precision (LPV) approaches when the unit is connected to a course deviation indicator. This SBAS correction service is what allows approach navigation to LPV minima, so the receiver is relevant for aircraft that fly instrument procedures. The COM radio is available with 25 kHz channel spacing in the GNC 355 and with 8.33 kHz spacing in the GNC 355A variant.
The front panel carries a capacitive touchscreen, a power and home button, a dual concentric rotary knob with push entry, an SD card slot and a photocell for display dimming. Bluetooth is built in and exchanges flight plans, GPS position and ADS-B weather and traffic data with a portable electronic device; it does not load software or databases. The internal attitude sensor can only drive an attitude display on a non-certified portable device.
For integration, the unit is a panel-mount navigator whose bezel measures 2 inches by 6.25 inches, matching the opening of older two-inch avionics such as the GNC 255 or GTR 225, which makes it a drop-in choice in many retrofit panels. Its physical interfaces are ARINC 429, RS-232 and analog outputs. ARINC 429 and RS-232 connect it to autopilots, traffic and other panel equipment, while analog and composite deviation outputs drive a course deviation indicator. The installation is described in the maker's Part 23 approved model list STC maintenance documentation.
Typical applications are certified general-aviation aircraft and rotorcraft panels where a space-saving replacement for an older navigator and radio is wanted, and cockpit installations that need WAAS approach capability without a larger unit. For integrators of crewed eVTOL or retrofit programmes, it serves as an example of a certified GNSS navigator and COM radio in a compact panel format.
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