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vii190-01182-01 Rev. A
Garmin GNC 255A/255B Pilot’s Guide
Contents
Product Registration and Support ......................................................................v
1 Getting Started ....................................................................................1-1
1.1 Product 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 (Monitor) Key ...............................................................1-4
1.3 USB Port ..............................................................................................1-4
2 Basic Operation ....................................................................................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