OK, you've successfully started running the executable. Now how do you make it do something useful? Let's follow these quick directions to get you set up correctly. The steps are:
Now, here are the steps again in finer detail:



Select the operating system specific device name corresponding to the serial port connected to the GPS receiver. This will be COMn (where n is a integer number) on Microsoft Windows, or /dev/ttySn or /dev/ttyUSBn on Linux or Mac OS X systems. If you do not see any device names in the device name drop-down, you are either using a connection unsupported by the RXTX communications library, or you do not have permission to access the device (check the privileges and/or Unix groups for your user account). Typically on Linux you will need to be a member of the "lock" group and "tty" or "dialout" group.
NOTE: There is a "feature" in Fedora Core 15 Linux (and possibly some other distros) where device lock files have been moved to a directory not known to the RXTX library. See the Configuring Serial GPS Ports page for how to work around this.

Select the operating system specific device name corresponding to the serial port connected to the TNC. This will be COMn (where n is a integer number) on Microsoft Windows, or /dev/ttySn or /dev/ttyUSBn on Linux or Mac OS X systems. If you do not see any device names in the device name drop-down, you are either using a connection unsupported by the RXTX communications library, or you do not have permission to access the device (check the privileges and/or Unix groups for your user account). Typically on Linux you will need to be a member of the "lock" group and "tty" or "dialout" group.
NOTE: There is a "feature" in Fedora Core 15 Linux (and possibly some other distros) where device lock files have been moved to a directory not known to the RXTX library. See the Configuring Serial TNC Ports page for how to work around this.
Select the operating system specific device name corresponding to the serial port connected to the weather station. This will be COMn (where n is a integer number) on Microsoft Windows, or /dev/ttySn or /dev/ttyUSBn on Linux or Mac OS X systems. If you do not see any device names in the device name drop-down, you are either using a connection unsupported by the RXTX communications library, or you do not have permission to access the device (check the privileges and/or Unix groups for your user account). Typically on Linux you will need to be a member of the "lock" group and "tty" or "dialout" group.
NOTE: There is a "feature" in Fedora Core 15 Linux (and possibly some other distros) where device lock files have been moved to a directory not known to the RXTX library. See the Configuring Serial Weather Station Ports page for how to work around this.
You can also download topographic (elevation) data from the U.S. Geological Survey by selecting the File->Topographic->Download Tiles menu choice. Note that this data is for worldwide landmasses (not just the United States), and is available to any user whose nation is permitted Internet access to the United States.