1 GETTING STARTED ............................................................................................................ 1-1
1.2 Pilot Controls ............................................................................................ 1-2
1.3 USB Port ................................................................................................... 1-4
2 BASIC OPERATION ............................................................................................................ 2-1
2.1 COM Radio ............................................................................................... 2-1
2.1.6 Stuck Mic ........................................................................................... 2-5
2.1.7 Connext Setup ................................................................................... 2-5
2.2 NAV Radio ................................................................................................ 2-6
2.3 OBS Mode ................................................................................................ 2-8
3 FUNCTIONS ........................................................................................................................... 3-1
3.1 Functions .................................................................................................. 3-1
3.2 COM Frequencies ..................................................................................... 3-2
3.3 NAV Frequencies ....................................................................................... 3-8
3.4 ICS Configuration ................................................................................... 3-13
3.4.1 Adjust Intercom ................................................................................ 3-13
3.4.2 AUX Audio ....................................................................................... 3-14
3.4.3 Intercom On/Off ............................................................................... 3-14
3.4.4 Speaker On/Off ................................................................................ 3-15
3.5.1 COM Spacing ................................................................................... 3-16
3.5.5 Database Info ................................................................................... 3-19
3.5.6 Load Database ................................................................................. 3-19
3.5.8 Serial Number .................................................................................. 3-20
190-01182-01 Rev. E
Garmin GNC 255A/255B Pilot's Guide
Table of Contents
v