My flight instructor showed me a cool flight-planning tool named SkyDemon. Unfortunately it is not available for Linux, but with wine it can be installed on my machine. Here is how to do it ...

FLARM is an electronic device to selectively alert pilots to potential collisions between aircraft.. The accessoirs (like antennas) are known to be expensive. This article shows how to build a 5 Euro ground plane antenna for a FLARM ground station which is perfectly suited to operate with the rtl-sdr based Open Glider Network receive. ...