GNC255A/255B Pilot's Guide
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A Garmin GNC 255A/255B Pilot's Guide vii Contents Product Registration and Support v 1 Getting Started 1-1 1.1 Product Description 1-1 1.2 Pilot Controls 1-2 1.2.1 Power/Com Volume/Squelch Knob 1-2 1.2.2 Nav Volume/ID Knob 1-2 1.2.3 Tuning LARGE/SMALL Concentric (Cursor) Knobs 1-3 1.2.4 FLIP/FLOP Key 1-3 1.2.5 C/N (Com/Nav) Key 1-3 1.2.6 OBS Key 1-3 1.2.7 T/F (To/From) Key 1-3 1.2.8 CLR (Clear) Key 1-3 1.2.9 ENT (Enter) Key 1-3 1.2.10 FUNC (Function) Key 1-4 1.2.11 MON...
A Garmin GNC 255A/255B Pilot's Guide vii Contents Product Registration and Support v 1 Getting Started 1-1 1.1 Product Description 1-1 1.2 Pilot Controls 1-2 1.2.1 Power/Com Volume/Squelch Knob 1-2 1.2.2 Nav Volume/ID Knob 1-2 1.2.3 Tuning LARGE/SMALL Concentric (Cursor) Knobs 1-3 1.2.4 FLIP/FLOP Key 1-3 1.2.5 C/N (Com/Nav) Key 1-3 1.2.6 OBS Key 1-3 1.2.7 T/F (To/From) Key 1-3 1.2.8 CLR (Clear) Key 1-3 1.2.9 ENT (Enter) Key 1-3 1.2.10 FUNC (Function) Key 1-4 1.2.11 MON...
GNC255A/255B Pilot's Guide
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... (FSS) Frequencies 3-8 3.2.7 Com Nearest Weather (WX) Frequencies 3-9 3.3 Nav Frequencies 3-10 3.3.1 Recent Nav Frequencies 3-10 3.3.2 Nav User Frequencies 3-11 3.3.2.1 Viewing the Nav User Frequency 3-11 3.3.2.2 Deleting the Nav User Frequency 3-11 3.3.2.3 Editing a Nav User Frequency 3-12 3.3.3 Nav Database Frequencies 3-13 3.3.4 Nav Nearest VOR 3-14 3.4 ICS Configuration 3-15 3.4.1 Adjust Intercom 3-15 3.4.2...3.6 Timers 3-23 3.6.1 Setting Up the Count Down Timer 3-23 3.6.2 Setting Up the Count Up Timer 3-24 viii Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. A
... (FSS) Frequencies 3-8 3.2.7 Com Nearest Weather (WX) Frequencies 3-9 3.3 Nav Frequencies 3-10 3.3.1 Recent Nav Frequencies 3-10 3.3.2 Nav User Frequencies 3-11 3.3.2.1 Viewing the Nav User Frequency 3-11 3.3.2.2 Deleting the Nav User Frequency 3-11 3.3.2.3 Editing a Nav User Frequency 3-12 3.3.3 Nav Database Frequencies 3-13 3.3.4 Nav Nearest VOR 3-14 3.4 ICS Configuration 3-15 3.4.1 Adjust Intercom 3-15 3.4.2...3.6 Timers 3-23 3.6.1 Setting Up the Count Down Timer 3-23 3.6.2 Setting Up the Count Up Timer 3-24 viii Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. A
GNC255A/255B Pilot's Guide
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... Nav Frequency Selection OBS Selection LARGE and SMALL Knobs (Frequency Adjust) Enter Key Clear Data Key Function Selection To/From Selection Figure 1-1 GNC 255 Front Panel Description 190-01182-01 Rev. The built-in 25 kHz steps (default). A Garmin GNC 255A/255B Pilot's Guide 1-1 The GNC 255... has the ability to 335 MHz) when the localizer is tuned. The GNC 255A is available with a 16 watt com...
... Nav Frequency Selection OBS Selection LARGE and SMALL Knobs (Frequency Adjust) Enter Key Clear Data Key Function Selection To/From Selection Figure 1-1 GNC 255 Front Panel Description 190-01182-01 Rev. The built-in 25 kHz steps (default). A Garmin GNC 255A/255B Pilot's Guide 1-1 The GNC 255... has the ability to 335 MHz) when the localizer is tuned. The GNC 255A is available with a 16 watt com...
GNC255A/255B Pilot's Guide
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...GNC 255 controls have been designed to simplify operation of the bezel controls audio volume for the Nav radio. A "SQ" indication appears to the left of the active Com frequency window in the upper left corner of the display when automatic squelch is overridden. 1.2.2 Nav Volume/ID Knob The Nav... knob, Nav volume/ID knob, and bezel keys. 1.2.1 Power/Com Volume/Squelch Knob The Power/Com Volume/Squelch knob located in the bottom left corner of the system and minimize workload and the time required to the left corner of the Nav active frequency. 1-2 Garmin GNC 255A/255B Pilot...
...GNC 255 controls have been designed to simplify operation of the bezel controls audio volume for the Nav radio. A "SQ" indication appears to the left of the active Com frequency window in the upper left corner of the display when automatic squelch is overridden. 1.2.2 Nav Volume/ID Knob The Nav... knob, Nav volume/ID knob, and bezel keys. 1.2.1 Power/Com Volume/Squelch Knob The Power/Com Volume/Squelch knob located in the bottom left corner of the system and minimize workload and the time required to the left corner of the Nav active frequency. 1-2 Garmin GNC 255A/255B Pilot...
GNC255A/255B Pilot's Guide
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...to toggle between the bearing TO or radial FROM the active VOR. The T/F key does not operate for tuning frequencies and data entry. A Garmin GNC 255A/255B Pilot's Guide 1-3 LARGE, Outer Knob SMALL, Inner Knob 1.2.4 FLIP/FLOP Key Press and release the FLIP/FLOP key to see the ...information. 1.2.3 Tuning LARGE/SMALL Concentric (Cursor) Knobs The LARGE right and SMALL right knobs are transmitting. 1.2.5 C/N (Com/Nav) Key Press the C/N key to select the Com or Nav (VLOC) radio mode. 1.2.6 OBS Key Press the OBS key to switch between the active (left-most) and standby (right...
...to toggle between the bearing TO or radial FROM the active VOR. The T/F key does not operate for tuning frequencies and data entry. A Garmin GNC 255A/255B Pilot's Guide 1-3 LARGE, Outer Knob SMALL, Inner Knob 1.2.4 FLIP/FLOP Key Press and release the FLIP/FLOP key to see the ...information. 1.2.3 Tuning LARGE/SMALL Concentric (Cursor) Knobs The LARGE right and SMALL right knobs are transmitting. 1.2.5 C/N (Com/Nav) Key Press the C/N key to select the Com or Nav (VLOC) radio mode. 1.2.6 OBS Key Press the OBS key to switch between the active (left-most) and standby (right...
GNC255A/255B Pilot's Guide
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... in the GNC 255. Pressing the FUNC key once displays the Function mode. A 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 (Function) key accesses function categories for updating the database. 1-4 Garmin GNC 255A/255B...
... in the GNC 255. Pressing the FUNC key once displays the Function mode. A 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 (Function) key accesses function categories for updating the database. 1-4 Garmin GNC 255A/255B...
GNC255A/255B Pilot's Guide
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... the Displayed Value to Nav mode. 2.2.3 Saving a Com Channel The current Standby frequency may be saved into the Com User Frequency database from the user frequency list. Press the MON key in the Com function to listen to the Active frequency. After selecting the desired characters, press ENT. 2-2 Garmin GNC 255A/255B Pilot's Guide...
... the Displayed Value to Nav mode. 2.2.3 Saving a Com Channel The current Standby frequency may be saved into the Com User Frequency database from the user frequency list. Press the MON key in the Com function to listen to the Active frequency. After selecting the desired characters, press ENT. 2-2 Garmin GNC 255A/255B Pilot's Guide...
GNC255A/255B Pilot's Guide
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...a "+" sign will be remembered for 30 minutes. After selection, the selected waypoint and type will have more frequencies for Com and Nav frequencies that are in the database when the unit is receiving a valid position input. After selecting the desired characters, press ENT. Waypoint...type will have more frequencies for Selection 2. 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. Identifier Field Active for Selection Turn SMALL Knob To Select Character Turn LARGE Knob ...
...a "+" sign will be remembered for 30 minutes. After selection, the selected waypoint and type will have more frequencies for Com and Nav frequencies that are in the database when the unit is receiving a valid position input. After selecting the desired characters, press ENT. Waypoint...type will have more frequencies for Selection 2. 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. Identifier Field Active for Selection Turn SMALL Knob To Select Character Turn LARGE Knob ...
GNC255A/255B Pilot's Guide
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... The current Standby frequency may be active. 2. After selecting the desired characters, press ENT. 2-6 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. 2.3 Nav Radio 2.3.1 Selecting a Nav Frequency The selection of the display will be saved into the Nav User Frequency database from the database and is between 108 and 117 MHz in 50 kHz...
... The current Standby frequency may be active. 2. After selecting the desired characters, press ENT. 2-6 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. 2.3 Nav Radio 2.3.1 Selecting a Nav Frequency The selection of the display will be saved into the Nav User Frequency database from the database and is between 108 and 117 MHz in 50 kHz...
GNC255A/255B Pilot's Guide
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... 2-13 Listening to the ID for a Nav Frequency Nav audio volume is enabled, the ID annunciation will appear to the Nav Audio Channel Nav ident is enabled by pressing the Nav Volume knob when the Nav display is active. Turn the LARGE knob to...Nav Volume knob clockwise to increase volume, or counterclockwise to move the cursor. After selecting the desired characters, press ENT. When Nav ident is adjusted using the Nav Volume knob. Nav Frequency Type List 2.3.3 Listening to the left of the active Nav frequency. Figure 2-12 Nav User Frequency Type Selection 8. A Garmin GNC 255A...
... 2-13 Listening to the ID for a Nav Frequency Nav audio volume is enabled, the ID annunciation will appear to the Nav Audio Channel Nav ident is enabled by pressing the Nav Volume knob when the Nav display is active. Turn the LARGE knob to...Nav Volume knob clockwise to increase volume, or counterclockwise to move the cursor. After selecting the desired characters, press ENT. When Nav ident is adjusted using the Nav Volume knob. Nav Frequency Type List 2.3.3 Listening to the left of the active Nav frequency. Figure 2-12 Nav User Frequency Type Selection 8. A Garmin GNC 255A...
GNC255A/255B Pilot's Guide
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...CDI/HSI, the OBS radial of your remote display will be on the screen of the GNC 255. Press the OBS key to change the displayed OBS values. A The GNC 255 graphic CDI is the decoded Nav Identifier from the Morse code broadcast by the station. 1. NOTE: The Identifier is shown ...as a graph of five dots right or left of the triangle icon. 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. 2.4 OBS Mode If your system is...
...CDI/HSI, the OBS radial of your remote display will be on the screen of the GNC 255. Press the OBS key to change the displayed OBS values. A The GNC 255 graphic CDI is the decoded Nav Identifier from the Morse code broadcast by the station. 1. NOTE: The Identifier is shown ...as a graph of five dots right or left of the triangle icon. 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. 2.4 OBS Mode If your system is...
GNC255A/255B Pilot's Guide
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If DST data is expected to be available. A Garmin GNC 255A/255B Pilot's Guide 2-9 If you will show DST data in the lower part of the 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. Station Identifier Bearing To/From Station Active Nav Frequency Distance To Station In Nautical Miles Time To Station In Hours and Minutes Ground Speed ...
If DST data is expected to be available. A Garmin GNC 255A/255B Pilot's Guide 2-9 If you will show DST data in the lower part of the 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. Station Identifier Bearing To/From Station Active Nav Frequency Distance To Station In Nautical Miles Time To Station In Hours and Minutes Ground Speed ...
GNC255A/255B Pilot's Guide
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... - Settings ENT - Reset Figure 3-1 Functions Diagram 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot's Guide 3-1 3 FUNCTIONS The Functions section allows provides information about Com Frequencies, Nav Frequencies, Internal Communications System (ICS) Configuration, System Configuration (SYS), and Timers (TMR). 3.1 Functions Description Com Freq Nav Freq ICS Config Recent Freqs User Freqs Database Nearest Apt Nearest...
... - Settings ENT - Reset Figure 3-1 Functions Diagram 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot's Guide 3-1 3 FUNCTIONS The Functions section allows provides information about Com Frequencies, Nav Frequencies, Internal Communications System (ICS) Configuration, System Configuration (SYS), and Timers (TMR). 3.1 Functions Description Com Freq Nav Freq ICS Config Recent Freqs User Freqs Database Nearest Apt Nearest...
GNC255A/255B Pilot's Guide
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... the COM, NAV, ICS, or SYS functions. 3. Press and release the FLIP/FLOP key to transfer the displayed channel to 25 kHz mode, any 8.33 kHzspecific user frequencies will be accessed in this function. NOTE: When switching from the user frequency list. Press FUNC to the Standby frequency position. 3-2 Garmin GNC 255A/255B Pilot...
... the COM, NAV, ICS, or SYS functions. 3. Press and release the FLIP/FLOP key to transfer the displayed channel to 25 kHz mode, any 8.33 kHzspecific user frequencies will be accessed in this function. NOTE: When switching from the user frequency list. Press FUNC to the Standby frequency position. 3-2 Garmin GNC 255A/255B Pilot...
GNC255A/255B Pilot's Guide
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...Standby Active Frequency Position In List. Turn the SMALL knob to the Standby frequency position. 3-10 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. 3.3 Nav Frequencies The Nav Frequencies category in the Functions section contains remotely acquired frequencies (Remote), recently used frequencies (Recent), ...), and a database of all frequencies provided in the standard default memory (Database). 3.3.1 Recent Nav Frequencies The last 20 Nav frequencies used are kept in the list of Recent Nav Frequencies and can be accessed in this function. 1. Turn the LARGE knob to select the...
...Standby Active Frequency Position In List. Turn the SMALL knob to the Standby frequency position. 3-10 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. 3.3 Nav Frequencies The Nav Frequencies category in the Functions section contains remotely acquired frequencies (Remote), recently used frequencies (Recent), ...), and a database of all frequencies provided in the standard default memory (Database). 3.3.1 Recent Nav Frequencies The last 20 Nav frequencies used are kept in the list of Recent Nav Frequencies and can be accessed in this function. 1. Turn the LARGE knob to select the...
GNC255A/255B Pilot's Guide
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...Figure 3-16 Viewing User Nav Frequencies 2. Turn SMALL Knob To Select Entry. Press ENT Key To Set Selected Freq As Standby Active Frequency Position In List. Press the ENT key to set the displayed frequency as the Standby frequency. A Garmin GNC 255A/255B Pilot's Guide 3-...11 Turn the SMALL knob to delete the displayed User frequency. Deleting the Nav User Frequency 1. While viewing a Nav User frequency, press the CLR key to view the Nav User Frequencies. 3.3.2.2 3. Press and release ...
...Figure 3-16 Viewing User Nav Frequencies 2. Turn SMALL Knob To Select Entry. Press ENT Key To Set Selected Freq As Standby Active Frequency Position In List. Press the ENT key to set the displayed frequency as the Standby frequency. A Garmin GNC 255A/255B Pilot's Guide 3-...11 Turn the SMALL knob to delete the displayed User frequency. Deleting the Nav User Frequency 1. While viewing a Nav User frequency, press the CLR key to view the Nav User Frequencies. 3.3.2.2 3. Press and release ...
GNC255A/255B Pilot's Guide
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... Frequency Function 2. After selecting the desired characters, press ENT. 3-12 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Press the Cursor knob to select the desired Nav User frequency and then press ENT. After selecting the desired characters, press ENT. 5. Turn the SMALL knob ... the cursor. Turn the SMALL knob to enable editing. Turn the LARGE knob to move the cursor. A 3.3.2.3 Editing a Nav User Frequency 1. Figure 3-20 Nav User Frequency Type Selection 7. The frequency MHz value will be selected. Turn the LARGE knob to select the kHz frequency value....
... Frequency Function 2. After selecting the desired characters, press ENT. 3-12 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Press the Cursor knob to select the desired Nav User frequency and then press ENT. After selecting the desired characters, press ENT. 5. Turn the SMALL knob ... the cursor. Turn the SMALL knob to enable editing. Turn the LARGE knob to move the cursor. A 3.3.2.3 Editing a Nav User Frequency 1. Figure 3-20 Nav User Frequency Type Selection 7. The frequency MHz value will be selected. Turn the LARGE knob to select the kHz frequency value....
GNC255A/255B Pilot's Guide
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... function. Press the ENT key to set the selected frequency as the Standby frequency. 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot's Guide 3-13 With the Nav Frequency Function highlighted, turn the SMALL knob to highlight a character. 3. Then, press ENT. 2. Turn the SMALL knob to... FLIP/FLOP Key To Set Selected Identifier Selected Freq As Active Wpt Type Figure 3-22 Selected Nav Database Frequency 6. 3.3.3 Nav Database Frequencies The GNC 255 contains a large database of Nav frequencies that may be highlighted. Press FUNC to the Previous Menu Turn SMALL Knob To Select ...
... function. Press the ENT key to set the selected frequency as the Standby frequency. 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot's Guide 3-13 With the Nav Frequency Function highlighted, turn the SMALL knob to highlight a character. 3. Then, press ENT. 2. Turn the SMALL knob to... FLIP/FLOP Key To Set Selected Identifier Selected Freq As Active Wpt Type Figure 3-22 Selected Nav Database Frequency 6. 3.3.3 Nav Database Frequencies The GNC 255 contains a large database of Nav frequencies that may be highlighted. Press FUNC to the Previous Menu Turn SMALL Knob To Select ...
GNC255A/255B Pilot's Guide
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... Found Press the ENT Key to Save Press the CLR Key To Return the Displayed Value to view the Nav Nearest VOR function. Then, press ENT. 3-14 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Press ENT Key To Set Selected Freq As Standby Selected Frequency ... highlighted, turn the SMALL knob to the Previous Menu Figure 3-23 Selected Nav Database Frequency 2. Figure 3-24 Selected Ident from Nav Database 3. Set the selected identifier as Active or Standby 3.3.4 Nav Nearest VOR The GNC 255, when interfaced with an appropriate GPS receiver, will report the 25 nearest VORs...
... Found Press the ENT Key to Save Press the CLR Key To Return the Displayed Value to view the Nav Nearest VOR function. Then, press ENT. 3-14 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Press ENT Key To Set Selected Freq As Standby Selected Frequency ... highlighted, turn the SMALL knob to the Previous Menu Figure 3-23 Selected Nav Database Frequency 2. Figure 3-24 Selected Ident from Nav Database 3. Set the selected identifier as Active or Standby 3.3.4 Nav Nearest VOR The GNC 255, when interfaced with an appropriate GPS receiver, will report the 25 nearest VORs...
GNC255A/255B Pilot's Guide
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...key to return to the Functions display. 3.4 ICS Configuration The Internal Communications System (ICS) Configuration allows you to adjust the intercom, set the Nav/Aux volume, turn the Intercom On/Off, and turn the intercom speaker On/Off. 3.4.1 Adjust Intercom The Adjust Intercom function allows you to make... key to view the Adjust Intercom function. 2. The Intercom On/Off function must be set the value. Then, press the ENT key. A Garmin GNC 255A/255B Pilot's Guide 3-15 Turn the SMALL knob to set to On to set it as the Standby frequency. Turn the SMALL knob to display...
...key to return to the Functions display. 3.4 ICS Configuration The Internal Communications System (ICS) Configuration allows you to adjust the intercom, set the Nav/Aux volume, turn the Intercom On/Off, and turn the intercom speaker On/Off. 3.4.1 Adjust Intercom The Adjust Intercom function allows you to make... key to view the Adjust Intercom function. 2. The Intercom On/Off function must be set the value. Then, press the ENT key. A Garmin GNC 255A/255B Pilot's Guide 3-15 Turn the SMALL knob to set to On to set it as the Standby frequency. Turn the SMALL knob to display...