ix190-01182-01 Rev. A Garmin GNC 255A/255B Pilot’s Guide3.6.3 Viewing Timers in the Com Display....................................... 3-244 Appendix ..............................................................................................4-14.1 Troubleshooting ................................................................................... 4-14.2 Updating the Frequency Database ........................................................ 4-34.2.1 Downloading the Frequency Database ................................... 4-34.2.2 Updating the GNC 255 Frequency Database .......................... 4-34.3 Messages ............................................................................................ 4-4Index .....................................................................................................Index-1