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.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.