Garmin GNC 255A Pilot's Manual
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Garmin GNC 255A Pilot's Manual

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GNC 255A/255B
Pilot's Guide

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  • Page 1 GNC 255A/255B Pilot's Guide...
  • Page 2 Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without the express written permission of Garmin. Garmin hereby grants permission to download a single copy of this manual and of any revision to...
  • Page 3 Pilots using an outdated database do so entirely at their own risk. NOTE Garmin recommends that if flying in a region with 8.33 kHz COM channel spacing, the radio should remain in 8.33 kHz mode. This will prevent the loss of stored user and recent frequencies.
  • Page 4 Operation of this device is subject to the following conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received, including interference that may cause undesired operation. Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...
  • Page 5 Warnings, Cautions, and Notes Product Registration and Support Help us better support you by completing your online registration today! Have the serial number of your product handy and connect to the Garmin website (www.garmin.com or https://fly.garmin.com/fly-garmin). Look for the Product Registration link on the Home page.
  • Page 6 INTENTIONALLY LEFT BLANK Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 7: Table Of Contents

    3.5.2 COM Sidetone (Software v2.10 or later) ........... 3-17 3.5.3 Display Brightness ................3-18 3.5.4 Display Contrast ................3-18 3.5.5 Database Info ................... 3-19 3.5.6 Load Database ................. 3-19 3.5.7 Software Version ................3-20 3.5.8 Serial Number .................. 3-20 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...
  • Page 8 3.6.3 Viewing Timers in the COM Display ..........3-22 4 DATABASE INFORMATION ................... 4-1 4.1 Downloading the Frequency Database ............4-1 4.2 Updating the GNC 255 Frequency Database ..........4-1 5 TROUBLESHOOTING ....................... 5-1 5.1 Messages ....................5-3 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 9: Getting Started

    MHz, in 25 kHz steps (default). For European operations, configuration for 8.33 kHz steps is provided with the GNC 255A (10 watt) and GNC 255B (16 watt). The GNC 255 VHF NAV receiver operates from 108 MHz to 117.95 MHz decoding both the VHF Omni Range and Localizer navigation signals.

  • Page 10: Pilot Controls

    Press the Power/COM Volume/Squelch knob again to return to automatic squelch operation. When the automatic squelch is overridden, an “SQ” indicator appears in the upper left corner of the display, left of the active COM frequency window. Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...
  • Page 11 FUNC key once displays the Function mode. Pressing the FUNC key a second time exits the Function mode. The MON (Monitor) key engages the monitor function. The standby frequency can be monitored while still listening to the active frequency. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...

  • Page 12: Usb Port

    The USB port is used to update the frequency database in the GNC 255. NOTE For updating the databases, Garmin recommends the use of a USB 2.0 compatible flash drive. The flash drive must be formatted as FAT32. Garmin GNC 255A/255B Pilot’s Guide...

  • Page 13: Basic Operation

    Frequencies with multiple types will have an asterisk next to the identifier. Press and release the FLIP/FLOP key to toggle the standby frequency to the active frequency. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...

  • Page 14: Monitoring The Standby Com Channeler

    Turn the outer knob to select the waypoint type. Turn the inner knob to select the type from the list. Press ENT to save displayed value. Press CLR to cancel the changes. Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...
  • Page 15 Automatic Terminal Information Service Automated Weather Observing System Aerodrome Traffic Frequency Arrival APPR Approach Departure Clearance CTAF Common Traffic Advisory Frequency Flight Service Station Remote Flight Service Station Mandatory Frequency Unicom Blank None 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...

  • Page 16: Com Database Look-Up

    Press ENT to copy the frequency into the standby frequency location. The nearest station identifier will show for the selected frequency if connected to a GPS position source. Press and release the FLIP/FLOP key to swap the active and standby frequencies. Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 17: Emergency Channel

    COM and NAV frequencies for the nearest facilities. Waypoint types with a “+” sign will have more frequencies for the same type. Airport Identifier Shown for Frequencies In Database Frequency Database Reverse Look-Up 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...

  • Page 18: Remote Frequency Selection Control

    THE DECODED NAV IDENTIFIER. Press and release the FLIP/FLOP key to toggle the standby frequency to the active frequency. NOTE Both NAV and COM frequencies cannot be displayed at the same time. Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 19: Saving A Nav Channel

    Press ENT to save displayed values. Press CLR to cancel the changes. NAV Frequency Type List FREQUENCY TYPE SYMBOL DESCRIPTION Very High Frequency Omni-Directional Range Distance Measuring Equipment Localizer Instrument Landing System 01-36 Runway Heading Blank None 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...

  • Page 20: Listening To The Nav Audio Channel

    Each dot indicates two degrees deflection with ten degrees full deflection to each side. Fly towards the bar to be on-course. Active NAV Frequency Reference COM Identifier Frequency OBS Setting CDI Deflection To/From Indication for Selected Station CDI Display Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 21: Distance/Speed/Time (Dst) Display

    T/F key to prompt the GNC to display DST data. NOTE DST information will only be displayed for stations that are within 200 NM. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...
  • Page 22 INTENTIONALLY LEFT BLANK 2-10 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 23: Functions

    Load Database Software Ver Serial Number Count Down Configuration ENT - Start/Stop CLR - Reset Push CRSR - Settings ENT - Accept Count Up ENT - Start/Stop CLR - Reset Functions Diagram 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...

  • Page 24: Com Frequencies

    When switching from 8.33 kHz to 25 kHz mode, any 8.33 kHz-specific user frequencies will be deleted from the user frequency list. This only affects the user frequencies within the 8.33 kHz spectrum. Frequency Waypoint Type Waypoint Name COM User Frequencies Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...
  • Page 25 Turn the inner knob to USER FREQS. Press ENT. Turn the inner knob to cycle through COM user frequencies. Press CLR to delete the selected user frequency. Press ENT to confirm deleting the selection. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...
  • Page 26 12. Turn the outer knob to select the TYPE field. 13. Turn the inner knob to select the frequency type. Waypoint Type COM User Frequency Type Selection 14. Press ENT to accept changes. Press CLR to cancel changes. Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 27: Com Database Frequencies

    The nearest station identifier for the selected frequency will be shown below the active or standby frequency, when connected to a GPS position source. Frequency Frequency Type Waypoint Identifier Selected COM Database Frequency 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...

  • Page 28: Com Nearest Airports (Apt)

    Turn the inner knob to scroll through the list of available ACC frequencies. Press FLIP/FLOP to set the selected frequency as the active frequency. Press ENT to set the selected frequency as the standby frequency. Press CLR to return to the functions display. Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 29: Com Nearest Flight Service Station (Fss) Frequencies

    Turn the inner knob to scroll through the available weather frequencies. Press FLIP/FLOP to set the selected frequency as the active frequency. Press ENT to set the selected frequency as the standby frequency. Press CLR to return to the functions display. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...

  • Page 30: Nav Frequencies

    Press ENT to set the displayed frequency as the standby frequency. 3.3.2 NAV User Frequencies Fifteen NAV user frequencies can be saved with an assigned waypoint (WPT) identifier and type. Active Position in List Frequency Selected Frequency Viewing User NAV Frequencies Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...
  • Page 31 Turn the inner knob to USER FREQS. Press ENT. Turn the inner knob to cycle through NAV user frequencies. Press the CLR key to delete the selected user frequency. Press ENT to confirm deleting the selection. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...
  • Page 32 13. Turn the outer knob to select the TYPE field. 14. Turn the inner knob to select the waypoint type. 15. Press ENT to accept changes. Press CLR to cancel changes. 3-10 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 33: Nav Database Frequencies

    Press FLIP/FLOP to set the selected frequency as the active frequency. Press ENT to set the selected frequency as the standby frequency. Frequency Frequency Type Waypoint Identifier Selected NAV Database Frequency 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide 3-11...

  • Page 34: Nav Nearest Vor

    Turn the inner knob to NEAREST VOR. Press ENT. Turn the inner knob to display the available VORs. Press ENT to set the displayed VOR frequency as standby. Press CLR to exit without changes. 3-12 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 35: Ics Configuration

    Turn outer knob to MUTE ON RX (software v2.10 or later). Turn the inner knob to ON or OFF. To mute when a radio transmission is received, select ON. 10. Press ENT to save changes. Press CLR to cancel the changes. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide 3-13...

  • Page 36: Aux Audio

    Turn the inner knob to INTRCOM ON/OFF. Press ENT. Turn the inner knob to set the Intercom ON or OFF. Press ENT to save the selected value. Press CLR to cancel the change. 3-14 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 37: Speaker On/Off

    Turn the inner knob to SPEAKER ON/OFF. Press ENT. Turn the inner knob to set the speaker output ON or OFF. Press ENT to save the selected value. Press CLR to cancel the change. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide 3-15...

  • Page 38: System Configuration

    Turn the inner knob to COM SPACING. Press ENT. Turn the inner knob to set the COM spacing. Press ENT to save the selected value. Press CLR to cancel the change. 3-16 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 39: Com Sidetone (Software V2.10 Or Later)

    If offset mode is selected, turn the outer knob to OFFSET. Turn the inner knob to set the offset value. Press ENT to save selected values. Press CLR to cancel the changes. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide 3-17...

  • Page 40: Display Brightness

    Turn the outer knob to SYS CONFIGURATION. Turn the inner knob to DSPL CONTRAST. Press ENT. Turn the inner knob to set the offset value. Press ENT to save selected value. Press CLR to cancel the change. 3-18 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 41: Database Info

    3.5.6 Load Database The GNC 255 has a USB port to allow for easily updating the system databases. NOTE Garmin recommends the use of a USB 2.0 compatible USB flash drive, formatted as FAT32, for updating the database. USB Port...

  • Page 42: Software Version

    Services Serial Number Page Press FUNC. Turn the outer knob to SYS CONFIGURATION. Turn the inner knob to SERIAL NUMBER. Press ENT. Press FUNC to return to the main menu. 3-20 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 43: Timers

    Press ENT. Press the ENT key to start the timer. Press the ENT key again to stop the timer. Press the CLR key to reset the timer to 0:00 and stop counting. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide 3-21...

  • Page 44: Viewing Timers In The Com Display

    The count down timer, which is counting up, will be highlighted. A count up timer will continue counting separately. Count Down Timer Value Highlighted When Counting Up COM Display with Count Down Timer Now Counting Up 3-22 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 45: Database Information

    The GNC 255 uses a standard USB flash drive to load the frequency database into the GNC 255. The flash drive is not provided by Garmin. The frequency database is stored internally and the USB flash drive is only used to transfer the database into the unit.
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  • Page 47: Troubleshooting

    System configuration (products, antennas, mounting locations, etc.) • Model number, part number, and serial number • Software versions • Description of the problem • Efforts made to isolate/solve the problem For aviation product support, visit flyGarmin.com. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...
  • Page 48 Resolver failure. Contact dealer. OBS readout displays “---” Calibration error. Recalibrate resolver. Display shows Corrupted system Contact factory. “COM Radio Needs calibration parameters Service” at start-up Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...

  • Page 49: Messages

    COM radio is tuned to COM locked to 121.5 121.5 MHz. 121.5. To exit this mode, MHz. Hold remote COM hold the COM remote transfer key to exit. transfer (COM RMT XFR) switch for two seconds. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...
  • Page 50 Contact Garmin Customer Support if this message persists. NOTE The GNC 255’s system ID is required when downloading the frequency database. See section 3.5.8 for details on the system ID. Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...
  • Page 51 COM remote frequency least 30 seconds. This Contact dealer for service decrement key is stuck. input will now be if this message persists. ignored. This input is not available in all installations. 190-01182-01 Rev. E Garmin GNC 255A/255B Pilot’s Guide...
  • Page 52 Navigation receiver service. The NAV radio needs service. may continue to function. VLOC RECEIVER - The NAV radio is not communicating property Contact dealer for service. Navigation receiver has with the system. failed. Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. E...
  • Page 54 190-01182-01 Rev. E...

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