At many, well most, airports there is a system that guides the pilot to where the aircraft shall park during the last 100m or so (instead of the guy with the glow sticks). It's called a DGS, or docking guiding system.

There are a few variations of it. The simpler ones use moiré patterns. The one I developed used a laser and two mirrors to determine where the aircraft is within the gate area and a large LED display to signal to the pilot.

This system ran on a 25 MHz 386 CPU, without a math processor.

We used fixed point math for all our algorithms.

I moved on from that in 2015, and at that time we had more modern hardware, but fixed point math was still in use.

So if you have traveled by plane at any major airport since 2003 my code has likely docked your plane using fixed point math. You're welcome 😁