TeleGPS ApplicationThis document is released under the terms of the Creative Commons ShareAlike 3.0 license. 15Click on the directory name to bring up a directory choosing dialog, select a new directory and clickSelect Directory to change where TeleGPS reads and writes data files.3.6.3. CallsignThis value is transmitted in each command packet sent from TeleDongle and received from analtimeter. It is not used in telemetry mode, as the callsign configured in the altimeter board is includedin all telemetry packets. Configure this with the TeleGPS operators call sign as needed to comply withyour local radio regulations.Note that to successfully command a flight computer over the radio (to configure the altimeter, monitoridle, or fire pyro charges), the callsign configured here must exactly match the callsign configured in theflight computer. This matching is case sensitive.3.6.4. Imperial UnitsThis switches between metric units (meters) and imperial units (feet and miles). This affects the displayof values use during flight monitoring, configuration, data graphing and all of the voice announcements.It does not change the units used when exporting to CSV files, those are always produced in metricunits.3.6.5. Serial DebugThis causes all communication with a connected device to be dumped to the console from whichTeleGPS was started. If you’ve started it from an icon or menu entry, the output will simply be discarded.This mode can be useful to debug various serial communication issues.3.6.6. Font sizeSelects the set of fonts used in the flight monitor window. Choose between the small, medium and largesets.3.6.7. Look & feelSwitches between the available Java user interface appearances. The default selection is supposed tomatch the native window system appearance for the target platform.3.6.8. Menu positionSelects the initial position for the main TeleGPS window that includes all of the command buttons.3.6.9. Map Cache SizeSets the number of map tiles kept in memory while the application is running. More tiles consume morememory, but will make panning around the map faster.3.6.10. Manage FrequenciesThis brings up a dialog where you can configure the set of frequencies shown in the various frequencymenus. You can add as many as you like, or even reconfigure the default set. Changing this list does notaffect the frequency settings of any devices, it only changes the set of frequencies shown in the menus.