Great project idea, however, I'd simply make use of a cheap Arduino (ebay) and the GPS module from Adafruit for $40. Then drive BCD out of the Arduino pins to your Nixie tubes. You'll only need 4 pins per tube for the BCD control.
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.