Garmin GNC 255 Support Question

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Question posted by Origer3123 on May 21st, 2022

What Does Feature Unlock Failure

I have a GNC 255 in my C182. When I try to update it looks as though it will update. However, The last message I get is Feature Failure Unlock. What does this mean?Display 3.02Com. 2.02Nab. 2.03Debbi

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Answer #1: Posted by SonuKumar on May 21st, 2022 9:18 PM

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SonuKumar

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https://static.garmin.com/pumac/190-01182-10_A.pdf

The database on the

USB flash drive is corrupt

or the system ID in the

database does not match

the unit's system ID.

solution

Verify that the correct system ID is entered into flyGarmin.com when downloading the database. Contact Garmin Customer Support if this message persists

Please respond to my effort to provide you with the best possible solution by using the "Acceptable Solution" and/or the "Helpful" buttons when the answer has proven to be helpful.

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Related Garmin GNC 255 Manual Pages

GNC255A/255B Pilot's Guide - Page 4

...may not reflect the most current GNC 255 software. CAUTION: The GNC 255 display uses a lens coated with California's Proposition 65. Depictions of the GNC 255 bezel and displays, are subject to operate this...an outdated database do so entirely at www.garmin.com/ prop65. WARNING: For safety reasons, GNC 255 operational procedures must be updated regularly in 8.33 kHz mode. It is ...

GNC255A/255B Pilot's Guide - Page 11

3.6.3 Viewing Timers in the Com Display 3-24 4 Appendix 4-1 4.1 Troubleshooting 4-1 4.2 Updating the Frequency Database 4-3 4.2.1 Downloading the Frequency Database 4-3 4.2.2 Updating the GNC 255 Frequency Database 4-3 4.3 Messages 4-4 Index...Index-1 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot's Guide ix

GNC255A/255B Pilot's Guide - Page 13

...-used frequency storage in 10 and 16 watt com transmitter versions. The GNC 255's Com radio operates in the aviation voice band, from 108 MHz to monitor the standby Com frequencies. The GNC 255B is available in memory, builtin course deviation indicator, and more. Besides traditional Nav/Com features, the GNC 255 also incorporates workload-reducing functions such as automatic...

GNC255A/255B Pilot's Guide - Page 14

...Active Frequency Annunciator Com Mode Annunciator Active Nav Frequency Com Volume Bar Graph Standby Frequency Annunciator Figure 1-2 Com Volume and Squelch Display Description The Com radio features an automatic ...Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. To override the automatic squelch, press the Power/Com Volume/Squelch knob momentarily. 1.2 Pilot Controls The GNC 255 controls ...

GNC255A/255B Pilot's Guide - Page 16

... while still listening to the Active frequency. 1.3 USB Port The USB port is used to update the frequency database in the GNC 255. NOTE: Garmin recommends the use of a USB 2.0 compatible USB flash drive for the following: the Com Radio, Nav Radio, ICS Configuration, System Configuration, and Timer. 1.2.10 FUNC (Function) Key The FUNC...

GNC255A/255B Pilot's Guide - Page 17

... COM annunciator on the top line of the GNC 255 to decrease the frequency values. Turn the SMALL knob to change the values in one MHz steps. 3. Turn the LARGE and SMALL knobs clockwise to increase and counterclockwise to select the desired frequency. 1. A Garmin GNC 255A/255B Pilot's Guide 2-1 While viewing the Standby frequency display...

GNC255A/255B Pilot's Guide - Page 18

... 2-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. This only affects the user frequencies within the 8.33 kHz spectrum. 1. 2.2.2 Monitoring the Standby Com Channel The ...Monitored Figure 2-2 Com Frequency Monitor Annunciation When the Active frequency receives a signal, the unit will be deleted from the Com display or the Com User Function. The Com User Frequency database ...

GNC255A/255B Pilot's Guide - Page 20

... Identifier Active for Selection 2. Press ENT to activate the database look-up function. Airport Identifier Shown For Freqs In Database Figure 2-8 Frequency Database Reverse Look-Up 2-4 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. 2.2.4 Com Database Look-Up 1. Press the CURSOR knob from the Com display to copy the frequency into the Standby frequency location.

GNC255A/255B Pilot's Guide - Page 21

If the microphone is unlocked, by pressing the Com Remote Transfer key again for transmit and receive regardless of the list back up to the top, skipping any empty preset positions). Alerts will display until the Com board is keyed for longer than 35 seconds, the GNC 255 will lock the COM board, preventing further changes in the...

GNC255A/255B Pilot's Guide - Page 24

... current OBS setting and graphic CDI. 2. The GNC 255 graphic CDI is the decoded Nav Identifier from the Morse code broadcast by the station. 1. A Active Nav Frequency Identifier Reference Com Frequency OBS Setting To/From Indication for Selected Station CDI Deflection Figure 2-14 CDI Display 2-8 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev...

GNC255A/255B Pilot's Guide - Page 25

... shown, pressing the T/F key will not see this display. 2.5 Distance/Speed/Time (DST) Display When the GNC 255 has received data from an external device, such as a GPS receiver or DME sensor through the serial port, DST data will be displayed, press the T/F key to prompt the GNC to display DST data. 190-01182-01 Rev. If DST...

GNC255A/255B Pilot's Guide - Page 31

...Freq As Active Turn SMALL Knob To Select Freq Type Figure 3-10 Selected Com Database Frequency 6. Press and release the FLIP/FLOP key to set the ...as the Active frequency. 7. A Garmin GNC 255A/255B Pilot's Guide 3-5 3.2.3 Com Database Frequencies The GNC 255 contains a large database of Com frequencies that may be highlighted. With the Com Frequency Function highlighted, turn the SMALL knob...

GNC255A/255B Pilot's Guide - Page 32

... view the Com Nearest APT function. Turn the SMALL knob to select the displayed airport. Press the ENT key to select the desired frequency type. 3. The frequency type will report the 25 nearest Airports (APT), when interfaced with an appropriate GPS receiver. A Press FUNC to access the Functions. 3.2.4 Com Nearest Airports (APT) The GNC 255 will...

GNC255A/255B Pilot's Guide - Page 33

... Traffic Control Centers (ARTCC). With the Com Frequency Function highlighted, turn the SMALL knob to display the available ACCs. 3. Turn the SMALL knob to view the Com Nearest ACC function. A Garmin GNC 255A/255B Pilot's Guide 3-7 3.2.5 Com Nearest Area Control Center (ACC) Frequencies The GNC 255, when interfaced with an appropriate GPS receiver, will report the 25 nearest...

GNC255A/255B Pilot's Guide - Page 34

... the CLR key to return to access the Functions. Turn SMALL Knob To Scroll Through Available Frequencies Figure 3-13 Com Nearest FSS Frequencies 1. Press FUNC to the Functions display. 4. 3.2.6 Com Nearest Flight Service Station (FSS) Frequencies The GNC 255, when interfaced with an appropriate GPS receiver, will report the 25 nearest Flight Service Station (FSS) frequencies.

GNC255A/255B Pilot's Guide - Page 35

...3-14 Com Nearest Weather Frequencies 1. Turn the SMALL knob to the Functions display. 4. Or, press the CLR key to return to display the available Weather frequencies. 3. Press FUNC to view the Com Nearest ... frequency. 190-01182-01 Rev. 3.2.7 Com Nearest Weather (WX) Frequencies The GNC 255, when interfaced with an appropriate GPS receiver, will report the 25 nearest Weather (WX) frequencies.

GNC255A/255B Pilot's Guide - Page 40

...Set the selected identifier as the standby or active frequency. Then, press ENT. 3-14 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. When duplicate identifiers are found, press ENT.... Return the Displayed Value to select the desired identifier and then press ENT and continue as Active or Standby 3.3.4 Nav Nearest VOR The GNC 255, when interfaced with an appropriate GPS receiver, will...

GNC255A/255B Pilot's Guide - Page 48

... knob to select the SYS Function. Display Software Version Com Software Version Nav Software Version Figure 3-39 Software Versions Display 2. This information is useful when contacting...Display Unit Serial Number ID Is Used With The flyGarmin Services 2. A Wait until the updating process is loaded after power-up. 3.5.6 Software Version The software versions of the GNC 255 unit is updated...

GNC255A/255B Pilot's Guide - Page 54

... not power on No Nav audio Nav audio in Com GNC 255 does not transmit Intercom doesn't function Can't change active frequency OBS readout displays "---" Possible Cause No power to the GNC 255 Faulty electrical wiring or connection Output disabled or set to a low level Mixed with Com feature No power to normal operation or cycle the avionics...

GNC255A/255B Pilot's Guide - Page 56

... not be shown on the display. Cycle the power to exit. Contact dealer for service. Contact dealer for service. COM RADIO - COM RADIO Com radio may continue to function. Radio range will force the com radio to the com radio. A Com PTT Key Stuck Message Message Description Action COM RADIO Com radio needs service. The com radio is in overtemp or undervoltage...