Garmin 255A- Manuals

Page 3 - LIMITED WARRANTY; Online Auction Purchases; International Purchases

i 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide LIMITED WARRANTY All Garmin avionics products are warranted to be free from defects in materials or workmanship for: two years from the date of purchase for new Remote-Mount and Panel-Mount products; one year from the date of purchase for new ...

Page 5 - NOTE; : Canadian installations: In accordance with Canadian Radio

iii 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide NOTE : Canadian installations: In accordance with Canadian Radio Specifications Standard 102 (RSS 102), RF field strength exposure to persons from an antenna connected to this device should be limited to 60 V/m for controlled environment and...

Page 7 - Product Registration and Support

v 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 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 web site (www.garmin.com or https://fly.garmin.com/fly-garmin). Lo...

Page 9 - Contents

vii 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide Contents Product Registration and Support ......................................................................v 1 Getting Started ....................................................................................1-1 1.1 Product Descripti...

Page 13 - GETTING STARTED; Product Description; Figure 1-1 GNC 255 Front Panel Description

1-1 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 1 GETTING STARTED 1.1 Product Description Combining a powerful VHF communications transceiver with 200 channel VOR, Localizer and Glideslope receivers, the GNC 255 provides a full-functioned navigation and communications solution in a small ...

Page 14 - Figure 1-2 Com Volume and Squelch Display Description; Nav

1-2 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 1.2 Pilot Controls The GNC 255 controls have been designed to simplify operation of the system and minimize workload and the time required to access sophisticated functionality. Controls are comprised of dual concentric knobs for frequency t...

Page 16 - : Garmin recommends the use of a USB 2.0 compatible USB flash

1-4 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 1.2.10 FUNC (Function) Key The FUNC (Function) key accesses function categories for the following: the Com Radio, Nav Radio, ICS Configuration, System Configuration, and Timer. Pressing the FUNC key once displays the Function mode. Pressing ...

Page 17 - BASIC OPERATION; Power On; Squelch; Com Radio; Selecting a Com Frequency; LARGE; Figure 2-1 Com Frequency Selection

2-1 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 2 BASIC OPERATION 2.1 Power On Turn the GNC 255 on by either turning the Power/Com Volume/ Squelch knob clockwise to turn the power on or, if installed, turning on the master switch that powers the radios. 2.2 Com Radio 2.2.1 Selecting a Com...

Page 18 - Monitoring the Standby Com Channel; frequency for activity, while listening to the Active frequency.; Figure 2-2 Com Frequency Monitor Annunciation; MON; . The Standby frequency is selected and the Waypoint; SMALL; knob to select characters.; knob to move the cursor.; Figure 2-3 Com User Frequency Name Selection; After selecting the desired characters, press; ENT

2-2 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 2.2.2 Monitoring the Standby Com Channel The Frequency Monitoring function allows you to monitor the Standby frequency for activity, while listening to the Active frequency. Press the MON key in the Com function to listen to the standby freq...

Page 19 - knob to select the waypoint Type.; knob to select the Type from the list.; Figure 2-4 Com User Frequency Type Selection; Frequency Type Symbol

2-3 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 5. Turn the LARGE knob to select the waypoint Type. 6. Turn the SMALL knob to select the Type from the list. Selected Wpt Type Figure 2-4 Com User Frequency Type Selection Frequency Type Symbol Description TWR Tower GND Ground ATIS Automatic...

Page 20 - Frequency Database Reverse Look-Up; Figure 2-8 Frequency Database Reverse Look-Up

2-4 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 2.2.4 Com Database Look-Up 1. Press the CURSOR knob from the Com display to activate the database look-up function. Identifier Field Active for Selection Turn LARGE Knob To Move Cursor Turn SMALL Knob To Select Character Figure 2-5 Database ...

Page 21 - Figure 2-9 Emergency Channel; The Emergency Channel will be inserted into the Active; : Pressing and holding the Com Remote Transfer (COM RMT XFR); : Under some circumstances if the Com system loses communication; Stuck Mic; Remote Frequency Selection Control; The standby frequency isn’t activated until a Com

2-5 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 2.2.6 Emergency Channel 1. Press and hold the FLIP/FLOP key or the Com Remote Transfer (COM RMT XFR) key for approximately two seconds. Figure 2-9 Emergency Channel 2. The Emergency Channel will be inserted into the Active Frequency position...

Page 22 - Selecting a Nav Frequency; Figure 2-10 Nav Frequency Selection; CAUTION; : The Identifier is determined from the database and is not the; : Both Nav and Com frequencies cannot be displayed at the same

2-6 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 2.3 Nav Radio 2.3.1 Selecting a Nav Frequency The selection of Nav frequencies is the same as for the Com frequencies. 1. Press the C/N key to reach the Nav radio function. The NAV annunciator on the top line of the display will show. 2. Tur...

Page 23 - Figure 2-12 Nav User Frequency Type Selection; After selecting the desired characters, press; Listening to the Nav Audio Channel; Nav ident is enabled by pressing the; Figure 2-13 Listening to the ID for a Nav Frequency; Nav audio volume is adjusted using the

2-7 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 5. Turn the LARGE knob to select the waypoint Type. 6. Turn the SMALL knob to select characters. 7. Turn the LARGE knob to move the cursor. Figure 2-12 Nav User Frequency Type Selection 8. After selecting the desired characters, press ENT . ...

Page 24 - : The Identifier is the decoded Nav Identifier from the Morse code; OBS; key to see the current OBS setting and graphic; and; knobs to change the displayed; Figure 2-14 CDI Display

2-8 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 2.4 OBS Mode If your system is configured with an external CDI/HSI, the OBS radial of your remote display will be decoded and displayed on the screen of the GNC 255. NOTE : The Identifier is the decoded Nav Identifier from the Morse code bro...

Page 25 - Figure 2-15 DST Data Display; : The If both GPS and DME data sources are connected to the GNC

2-9 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 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 available. If you are not connected to an external sensor, you w...

Page 27 - FUNCTIONS; Functions Description; Timers; Figure 3-1 Functions Diagram

3-1 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 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 Timers Count Do...

Page 28 - Com Frequencies; The last 20 Com frequencies used are kept in the list of Recent Com; Figure 3-2 Recent Com Frequencies

3-2 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 1. Press the FUNC key to access the Functions. 2. Turn the LARGE knob to select the COM, NAV, ICS, or SYS functions. 3. Turn the SMALL knob to view the choices in each function. 4. Press the ENT key to access the function. 5. Press the FUNC ...

Page 29 - Viewing the Com User Frequency; Figure 3-3 Viewing User Com Frequencies; Deleting the Com User Frequency; Figure 3-4 Deleting User Com Frequencies

3-3 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 3.2.2 Com User Frequencies Fifteen Com User Frequencies can be saved with an assigned waypoint (WPT) identifier and Type. NOTE : When switching from 8.33 kHz to 25 kHz mode, any 8.33 kHz- specific user frequencies will be deleted from the us...

Page 30 - Editing a Com User Frequency; Figure 3-5 Com User Frequency Function; Figure 3-6 Com User Frequency Value Selection; Figure 3-7 Com User Frequency Name Selection; Figure 3-8 Com User Frequency Type Selection

3-4 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 2. Press the ENT key to confirm deletion of the displayed frequency. 3.2.2.3 Editing a Com User Frequency 1. Press FUNC . Turn the LARGE knob to reach the Com functions and then turn the SMALL knob to select the Com User Frequencies. Press E...

Page 31 - recalled by identifier.; Figure 3-9 Com Database Frequencies

3-5 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 3.2.3 Com Database Frequencies The GNC 255 contains a large database of Com frequencies that may be recalled by identifier. Turn LARGE Knob To Move Cursor Turn SMALL Knob To Select Character Figure 3-9 Com Database Frequencies 1. Press FUNC ...

Page 32 - with an appropriate GPS receiver.; Figure 3-11 Com Nearest APT Frequencies

3-6 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 3.2.4 Com Nearest Airports (APT) The GNC 255 will report the 25 nearest Airports (APT), when interfaced with an appropriate GPS receiver. Turn SMALL Knob To Scroll Through Available Airports Figure 3-11 Com Nearest APT Frequencies 1. Press F...

Page 33 - Frequencies; Figure 3-12 Com Nearest ACC Frequencies

3-7 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 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 Area Control Center (ACC) frequencies. ACCs are also known as Air Route Traffic Control Centers...

Page 34 - Figure 3-13 Com Nearest FSS Frequencies

3-8 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 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. Turn SMALL Knob To Scroll Through Available Freque...

Page 35 - Figure 3-14 Com Nearest Weather Frequencies

3-9 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 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. Turn SMALL Knob To Scroll Through Available Frequencies Figure 3-14 Com Nearest We...

Page 36 - and can be accessed in this function.; Figure 3-15 Recent Nav Frequencies

3-10 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 3.3 Nav Frequencies The Nav Frequencies category in the Functions section contains remotely acquired frequencies (Remote), recently used frequencies (Recent), user-defined frequencies (User), and a database of all frequencies provided in th...

Page 37 - Viewing the Nav User Frequency; Figure 3-16 Viewing User Nav Frequencies; Deleting the Nav User Frequency; Figure 3-17 Deleting User Nav Frequencies

3-11 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 3.3.2 Nav User Frequencies Up to 15 Nav User Frequencies can be saved with an assigned waypoint (WPT) identifier and Type. 3.3.2.1 Viewing the Nav User Frequency 1. Press FUNC to access the Functions. Turn the LARGE knob to select the Nav F...

Page 38 - Editing a Nav User Frequency; Figure 3-18 Nav User Frequency Function

3-12 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 3.3.2.3 Editing a Nav User Frequency 1. Press FUNC . Turn the LARGE knob to reach the Nav functions and then turn the SMALL knob to select the Nav User Frequencies. Press ENT . Figure 3-18 Nav User Frequency Function 2. Turn the SMALL knob ...

Page 39 - Figure 3-21 Nav Database Frequencies

3-13 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 3.3.3 Nav Database Frequencies The GNC 255 contains a large database of Nav frequencies that may be recalled by identifier. 1. Press FUNC to access the Functions. With the Nav Frequency Function highlighted, turn the SMALL knob to view the ...

Page 40 - Duplicate Identifiers; Figure 3-23 Selected Nav Database Frequency; Nav Nearest VOR; the 25 nearest VORs.; Figure 3-26 Nav Nearest VOR Frequencies

3-14 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A Duplicate Identifiers 1. When duplicate identifiers are found, press ENT . Duplicate Identifiers Found Press the ENT Key to Save the Displayed Value Press the CLR Key To Return to the Previous Menu Figure 3-23 Selected Nav Database Frequenc...

Page 41 - ICS Configuration; Adjust Intercom; Figure 3-27 Select the Adjust Intercom Function

3-15 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 2. Turn the SMALL knob to display the available VORs. 3. Press the ENT key to accept the displayed VOR and set it as the Standby frequency. Or, press the CLR key to return to the Functions display. 3.4 ICS Configuration The Internal Communi...

Page 42 - Aux Audio; Figure 3-29 Select the Aux Audio Function

3-16 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 3.4.2 Aux Audio The Aux function allows you to turn Aux Audio On/Off and set the volume value. 1. Press FUNC to access the Functions. Turn the LARGE knob to select the ICS Function. Turn the SMALL knob to view the Aux Volume function. Then,...

Page 43 - The Speaker On/Off function toggles speaker output on and off.

3-17 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 3.4.3 Intercom On/Off The Intercom On/Off function toggles intercom on and off. The intercom can also be toggled on/off with a remote switch, if installed. The Intercom On/Off function must be set to On to make the Adjust Intercom function ...

Page 44 - System Configuration; Com spacing may be selected between 8.33 kHz and 25 kHz to allow for; Figure 3-33 Com Spacing Display

3-18 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 3.5 System Configuration The System Configuration function will show the Software Version, Database Info, and Serial Number as well as, allowing you to set values for the Com spacing, Display Brightness, and Display Contrast, and use the Lo...

Page 45 - to access the Functions. Turn the; Figure 3-34 Set Display Brightness

3-19 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 3.5.2 Display Brightness As it arrives from the factory, the GNC 255 automatically adjusts its display brightness for the current lighting conditions. A small sensor on the display is used for this function. A manual adjustment is available...

Page 46 - Display Contrast; Figure 3-35 Set Display Contrast; Database Info; is useful when contacting Customer Support.; Figure 3-36 Database Info Display

3-20 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 3.5.3 Display Contrast The Display Contrast has a range from -50 (Low Display Contrast) and 50 (High Display Contrast) with 0 as the default. The range can be adjusted by using the SMALL knob to adjust the value. 1. Press FUNC to access the...

Page 47 - Load Database; Figure 3-37 USB Update Progress; FUNC; Figure 3-38 Database Update Display; Figure 3-39 Verify Database Version

3-21 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 3.5.5 Load Database The GNC 255 has a USB connector to allow for easily updating the system databases. NOTE : Garmin recommends the use of a USB 2.0 compatible USB flash drive for updating the database. 1. Insert the supplied cable into the...

Page 48 - Software Version; Figure 3-39 Software Versions Display; Serial Number; useful when contacting Customer Support.; Figure 3-40 Serial Number Display

3-22 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 5. Wait until the updating process is complete and then remove the memory device and cable. The unit will reset automatically once the database is updated. 6. Verify the correct frequency database is loaded after power-up. 3.5.6 Software Ve...

Page 49 - Setting Up the Count Down Timer; Figure 3-41 Select the Count Down Timer Function

3-23 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 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 countdown timer always takes precedence if it is running. 3.6.1 Setting Up the Co...

Page 50 - Setting Up the Count Up Timer; Figure 3-44 Select the Count Up Timer Function; Figure 3-45 Selecting the Count Up Timer; Viewing Timers in the Com Display; Figure 3-46 Timer Value Shown in the Com Display

3-24 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 3.6.2 Setting Up the Count Up Timer 1. Press FUNC to access the Functions. Turn the LARGE knob to select the Timer (TMR) function. Turn the SMALL knob to select the Count Up Timer function. Now, press the ENT key. Select Count Up Timer Figu...

Page 51 - Figure 3-48 Count Down Timer Value Now Counting Up

3-25 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide When the Count Down Timer reaches 0:00, it will continue counting as a Count Up value. The Count Down Timer that is counting up will be highlighted. A Count Up Timer will continue counting separately. Count Down Timer Value Highlighted When...

Page 53 - APPENDIX; Please have the following information ready:

4-1 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide 4 APPENDIX 4.1 Troubleshooting If efforts to resolve the problem fail, contact your dealer or the factory for technical assistance. The Garmin customer service staff will gladly assist you. Please have the following information ready: • Syst...

Page 55 - Table 4-1 Troubleshooting; Updating the Frequency Database; The GNC 255 uses a standard USB memory device to load the frequency; The data contained in the frequency database comes from; Downloading the Frequency Database

4-3 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide Problem Possible Cause Action Display shows “Incorrect Calibration Checksum” at start-up Corrupted system calibration parameters Contact factory Table 4-1 Troubleshooting 4.2 Updating the Frequency Database The GNC 255 uses a standard USB me...

Page 56 - Message

4-4 Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A 4.3 Messages When a Message has been issued by the unit, the Message will be shown on the display. After viewing the messages, touch the ENT key to acknowledge the message and return to the previously viewed page. An acknowledged message wil...

Page 61 - INDEX

Index-1 190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide INDEX A Appendix 4-1 B Basic operation 2-1Brightness 3-19 C Cautions ii, 2-6Clear 1-3Com database frequencies 3-5, 3-6, 3-7, 3-8, 3-9 Com frequencies 3-2Com PTT 3-18Com radio 2-1Com;Select frequency 2-1Com spacing 3-18Com user frequencie...