GNC255A/255B Pilot's Guide
Page 9
... 2-1 2.1 Power On 2-1 2.2 Com Radio 2-1 2.2.1 Selecting a Com Frequency 2-1 2.2.2 Monitoring the Standby Com Channel 2-2 2.2.3 Saving a Com Channel 2-2 2.2.4 Com Database Look-Up 2-4 2.2.5 Frequency Database Reverse Look-Up 2-4 2.2.6 Emergency Channel 2-5 2.2.7 Stuck Mic 2-5 2.2.8 Remote Frequency Selection Control 2-5 2.3 Nav Radio 2-6 2.3.1 Selecting a Nav Frequency 2-6 2.3.2 Saving a Nav Channel 2-6 2.3.3 Listening to the Nav Audio Channel 2-7 2.4 OBS Mode 2-8 2.5 Distance/Speed/Time (DST) Display 2-9 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot...
... 2-1 2.1 Power On 2-1 2.2 Com Radio 2-1 2.2.1 Selecting a Com Frequency 2-1 2.2.2 Monitoring the Standby Com Channel 2-2 2.2.3 Saving a Com Channel 2-2 2.2.4 Com Database Look-Up 2-4 2.2.5 Frequency Database Reverse Look-Up 2-4 2.2.6 Emergency Channel 2-5 2.2.7 Stuck Mic 2-5 2.2.8 Remote Frequency Selection Control 2-5 2.3 Nav Radio 2-6 2.3.1 Selecting a Nav Frequency 2-6 2.3.2 Saving a Nav Channel 2-6 2.3.3 Listening to the Nav Audio Channel 2-7 2.4 OBS Mode 2-8 2.5 Distance/Speed/Time (DST) Display 2-9 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot...
GNC255A/255B Pilot's Guide
Page 10
... On/Off 3-17 3.5 System Configuration 3-18 3.5.1 Com Spacing 3-18 3.5.2 Display Brightness 3-19 3.5.3 Display Contrast 3-20 3.5.4 Database Info 3-20 3.5.5 Load Database 3-21 3.5.6 Software Version 3-22 3.5.7 Serial Number 3-22 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.
... On/Off 3-17 3.5 System Configuration 3-18 3.5.1 Com Spacing 3-18 3.5.2 Display Brightness 3-19 3.5.3 Display Contrast 3-20 3.5.4 Database Info 3-20 3.5.5 Load Database 3-21 3.5.6 Software Version 3-22 3.5.7 Serial Number 3-22 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.
GNC255A/255B Pilot's Guide
Page 13
...GNC 255 provides a full-functioned navigation and communications solution in 10 and 16 watt com transmitter versions. The GNC 255 is available in a small footprint at a very affordable price. The GNC 255B is available with a 16 watt com transmitter. A Garmin GNC 255A/255B Pilot's Guide 1-1 The GNC 255...and Localizer navigation signals. The GNC 255 VHF Nav receiver operates from 118.000 to monitor the standby Com frequencies. The GNC 255A is available with a 10 watt com transmitter. Besides traditional Nav/Com features, the GNC 255 also incorporates workload-reducing functions ...
...GNC 255 provides a full-functioned navigation and communications solution in 10 and 16 watt com transmitter versions. The GNC 255 is available in a small footprint at a very affordable price. The GNC 255B is available with a 16 watt com transmitter. A Garmin GNC 255A/255B Pilot's Guide 1-1 The GNC 255...and Localizer navigation signals. The GNC 255 VHF Nav receiver operates from 118.000 to monitor the standby Com frequencies. The GNC 255A is available with a 10 watt com transmitter. Besides traditional Nav/Com features, the GNC 255 also incorporates workload-reducing functions ...
GNC255A/255B Pilot's Guide
Page 14
... will appear to the left corner of the Nav active frequency. 1-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. This facilitates listening to automatic squelch operation. 1.2 Pilot Controls The GNC 255 controls have been designed to simplify operation of the bezel controls audio volume for the Com radio. To override the automatic squelch, press the...
... will appear to the left corner of the Nav active frequency. 1-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. This facilitates listening to automatic squelch operation. 1.2 Pilot Controls The GNC 255 controls have been designed to simplify operation of the bezel controls audio volume for the Com radio. To override the automatic squelch, press the...
GNC255A/255B Pilot's Guide
Page 15
...) Key Press the ENT key to save selected values, to confirm a prompt, or to save the Standby frequency. 190-01182-01 Rev. 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 toggle between the ... active VOR. 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 see the current OBS setting and graphic CDI.
...) Key Press the ENT key to save selected values, to confirm a prompt, or to save the Standby frequency. 190-01182-01 Rev. 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 toggle between the ... active VOR. 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 see the current OBS setting and graphic CDI.
GNC255A/255B Pilot's Guide
Page 16
1.2.10 FUNC (Function) Key The FUNC (Function) key accesses function categories for updating the database. 1-4 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. A Pressing the FUNC key once displays the Function mode. Pressing the FUNC key a second time exits the ... may be monitored 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 (Function) key accesses function categories for updating the database. 1-4 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. A Pressing the FUNC key once displays the Function mode. Pressing the FUNC key a second time exits the ... may be monitored 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.
GNC255A/255B Pilot's Guide
Page 18
.... After selecting the desired characters, press ENT. 2-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Monitoring is turned off by switching to 25 kHz mode, any 8.33 kHzspecific user frequencies will be saved into the Com User Frequency database from the user frequency list. The ...Active frequency quality is selected and the Waypoint name field will be deleted from the Com display or the Com User Function. NOTE: When switching from 8.33 kHz to Nav mode. 2.2.3 Saving a Com Channel The current Standby frequency may be active. 2. Press the MON key in the...
.... After selecting the desired characters, press ENT. 2-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Monitoring is turned off by switching to 25 kHz mode, any 8.33 kHzspecific user frequencies will be saved into the Com User Frequency database from the user frequency list. The ...Active frequency quality is selected and the Waypoint name field will be deleted from the Com display or the Com User Function. NOTE: When switching from 8.33 kHz to Nav mode. 2.2.3 Saving a Com Channel The current Standby frequency may be active. 2. Press the MON key in the...
GNC255A/255B Pilot's Guide
Page 20
...Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Turn the SMALL knob to select characters and turn the LARGE knob to scroll through the list of waypoint types. Waypoint Types with a "+" sign will have more frequencies for Selection 2. After selection, the selected waypoint and type will be remembered for Com and Nav... for the same type. Press ENT to activate the database look-up function. Press the CURSOR knob from the Com display to copy the frequency into the Standby frequency location. Selected Identifier Figure 2-6 Database Identifier Selection 3. Waypoint Types...
...Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Turn the SMALL knob to select characters and turn the LARGE knob to scroll through the list of waypoint types. Waypoint Types with a "+" sign will have more frequencies for Selection 2. After selection, the selected waypoint and type will be remembered for Com and Nav... for the same type. Press ENT to activate the database look-up function. Press the CURSOR knob from the Com display to copy the frequency into the Standby frequency location. Selected Identifier Figure 2-6 Database Identifier Selection 3. Waypoint Types...
GNC255A/255B Pilot's Guide
Page 22
...the cursor. NOTE: Both Nav and Com frequencies cannot be displayed at the same time. 2.3.2 Saving a Nav Channel The current Standby frequency may be active. 2. Turn the LARGE knob to the Active frequency. After selecting the desired characters, press ENT. 2-6 Garmin GNC 255A/255B Pilot's Guide 190-01182...-01 Rev. The MHz selection range is between 108 and 117 MHz in one MHz steps. 3. The NAV annunciator on the top line of Nav frequencies is not the decoded Nav Identifier. 4. Turn the SMALL ...
...the cursor. NOTE: Both Nav and Com frequencies cannot be displayed at the same time. 2.3.2 Saving a Nav Channel The current Standby frequency may be active. 2. Turn the LARGE knob to the Active frequency. After selecting the desired characters, press ENT. 2-6 Garmin GNC 255A/255B Pilot's Guide 190-01182...-01 Rev. The MHz selection range is between 108 and 117 MHz in one MHz steps. 3. The NAV annunciator on the top line of Nav frequencies is not the decoded Nav Identifier. 4. Turn the SMALL ...
GNC255A/255B Pilot's Guide
Page 24
... is shown as a graph of five dots right or left of the GNC 255. Each dot indicates two degrees deflection with an external CDI/HSI, the OBS radial of your system is the decoded Nav Identifier from the Morse code broadcast by the station. 1. Fly towards the...If your remote display will be on the screen of the triangle icon. 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. Press the OBS key to be decoded and...
... is shown as a graph of five dots right or left of the GNC 255. Each dot indicates two degrees deflection with an external CDI/HSI, the OBS radial of your system is the decoded Nav Identifier from the Morse code broadcast by the station. 1. Fly towards the...If your remote display will be on the screen of the triangle icon. 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. Press the OBS key to be decoded and...
GNC255A/255B Pilot's Guide
Page 27
.../Stop CLR - Reset Figure 3-1 Functions Diagram 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot's Guide 3-1 Start/Stop CLR - 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...
.../Stop CLR - Reset Figure 3-1 Functions Diagram 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot's Guide 3-1 Start/Stop CLR - 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...
GNC255A/255B Pilot's Guide
Page 28
Turn the LARGE knob to the Standby frequency position. 3-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Press the FUNC key again to exit Functions. 3.2 Com Frequencies The Com Frequencies category in the Functions section contains recently used frequencies (Recent), user-defined frequencies (User), and a database ...only affects the user frequencies within the 8.33 kHz spectrum. 1. Press the ENT key to transfer the displayed channel to select the COM, NAV, ICS, or SYS functions. 3. Press the ENT key to the Active frequency position. Press and release the FLIP/FLOP key to ...
Turn the LARGE knob to the Standby frequency position. 3-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. Press the FUNC key again to exit Functions. 3.2 Com Frequencies The Com Frequencies category in the Functions section contains recently used frequencies (Recent), user-defined frequencies (User), and a database ...only affects the user frequencies within the 8.33 kHz spectrum. 1. Press the ENT key to transfer the displayed channel to select the COM, NAV, ICS, or SYS functions. 3. Press the ENT key to the Active frequency position. Press and release the FLIP/FLOP key to ...
GNC255A/255B Pilot's Guide
Page 48
... Number Display Unit Serial Number ID Is Used With The flyGarmin Services 2. Then, press the ENT key. Display Software Version Com Software Version Nav Software Version Figure 3-39 Software Versions Display 2. Turn the LARGE knob to view the Serial Number function. This information is ... is loaded after power-up. 3.5.6 Software Version The software versions of the GNC 255 unit is updated. 6. A 5. The unit will reset automatically once the database is displayed. Press the FUNC key to return to the main menu. 3-22 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev.
... Number Display Unit Serial Number ID Is Used With The flyGarmin Services 2. Then, press the ENT key. Display Software Version Com Software Version Nav Software Version Figure 3-39 Software Versions Display 2. Turn the LARGE knob to view the Serial Number function. This information is ... is loaded after power-up. 3.5.6 Software Version The software versions of the GNC 255 unit is updated. 6. A 5. The unit will reset automatically once the database is displayed. Press the FUNC key to return to the main menu. 3-22 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev.
GNC255A/255B Pilot's Guide
Page 49
... setting, press the ENT key. A Garmin GNC 255A/255B Pilot's Guide 3-23 Select Count Down Timer Figure 3-41 Select the Count Down Timer Function 2. 3.6 Timers The GNC 255 has both Count Up and Count Down timers, which may operate simultaneously and are shown in the lower right of the Com/Nav displays. The Default (Starting) Value Push...
... setting, press the ENT key. A Garmin GNC 255A/255B Pilot's Guide 3-23 Select Count Down Timer Figure 3-41 Select the Count Down Timer Function 2. 3.6 Timers The GNC 255 has both Count Up and Count Down timers, which may operate simultaneously and are shown in the lower right of the Com/Nav displays. The Default (Starting) Value Push...
GNC255A/255B Pilot's Guide
Page 54
...Check ICS page, Intercom On/Off, Adjust Intercom If in Lock Out mode, press the external Com FLIP/FLOP key for two seconds to return to be changed. Contact dealer Recalibrate resolver 4-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. A If the condition persists, contact dealer. In...or via the menu. No voice activation, or if must talk too loud Com Radio not communicating. Problem GNC 255 does not power on No Nav audio Nav audio in lockout mode. The radio may also be in Com GNC 255 does not transmit Intercom doesn't function Can't change active frequency OBS readout ...
...Check ICS page, Intercom On/Off, Adjust Intercom If in Lock Out mode, press the external Com FLIP/FLOP key for two seconds to return to be changed. Contact dealer Recalibrate resolver 4-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. A If the condition persists, contact dealer. In...or via the menu. No voice activation, or if must talk too loud Com Radio not communicating. Problem GNC 255 does not power on No Nav audio Nav audio in lockout mode. The radio may also be in Com GNC 255 does not transmit Intercom doesn't function Can't change active frequency OBS readout ...
GNC255A/255B Pilot's Guide
Page 61
A Garmin GNC 255A/255B Pilot's Guide Index-1 INDEX A Appendix 4-1 B Basic operation 2-1 Brightness 3-19 C Cautions ii, 2-6 Clear 1-3 Com database frequencies 3-5, 3-6, 3-7, 3-8, 3-9 Com frequencies 3-2 Com PTT 3-18 Com radio 2-1 Com;Select frequency 2-1 Com spacing 3-18 Com user frequencies 3-3 Com volume 1-2 Contrast 3-20 Controls 1-2 Cursor 1-3 Customer service i, 4-1 D Database frequencies 3-5, 3-13, 4-3 Database look-up 2-4 Display brightness 3-19 DST 2-9 Duplicate identifiers 3-14 E Emergency channel 2-5 Enter 1-3 F Flight Service ...
A Garmin GNC 255A/255B Pilot's Guide Index-1 INDEX A Appendix 4-1 B Basic operation 2-1 Brightness 3-19 C Cautions ii, 2-6 Clear 1-3 Com database frequencies 3-5, 3-6, 3-7, 3-8, 3-9 Com frequencies 3-2 Com PTT 3-18 Com radio 2-1 Com;Select frequency 2-1 Com spacing 3-18 Com user frequencies 3-3 Com volume 1-2 Contrast 3-20 Controls 1-2 Cursor 1-3 Customer service i, 4-1 D Database frequencies 3-5, 3-13, 4-3 Database look-up 2-4 Display brightness 3-19 DST 2-9 Duplicate identifiers 3-14 E Emergency channel 2-5 Enter 1-3 F Flight Service ...
GNC255A/255B Pilot's Guide
Page 62
R Recent com frequencies 3-2 Recent nav frequencies 3-10 Record of Revisions vi Registration v Remote frequency control 2-5 Reverse look-up 2-4 Revisions vi S Saving a com channel 2-2 Saving a nav channel 2-6 Serial Number 3-22 Software version 3-22 Speaker On/Off 3-17 Squelch 1-2 Stuck mic 2-5 Support v System configuration 3-18 T Timers 3-23 To-From 1-3 Troubleshooting 4-1, 4-4 U Updating frequency database 4-3 USB 1-4, 3-21 User frequencies 3-3, 3-11 V Volume 1-2 W Warranty i Index-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. A
R Recent com frequencies 3-2 Recent nav frequencies 3-10 Record of Revisions vi Registration v Remote frequency control 2-5 Reverse look-up 2-4 Revisions vi S Saving a com channel 2-2 Saving a nav channel 2-6 Serial Number 3-22 Software version 3-22 Speaker On/Off 3-17 Squelch 1-2 Stuck mic 2-5 Support v System configuration 3-18 T Timers 3-23 To-From 1-3 Troubleshooting 4-1, 4-4 U Updating frequency database 4-3 USB 1-4, 3-21 User frequencies 3-3, 3-11 V Volume 1-2 W Warranty i Index-2 Garmin GNC 255A/255B Pilot's Guide 190-01182-01 Rev. A