A colleague spent a day looking for a certain type of industrial main power switch (the rotating red-yellow thing seen on electrical cabinets) - this is the type of component that is normally really easily found.
EDIT: I forgot to add - in the end no switch could be found and we ended up...
Barring feature recognition against a known map, I'm not sure what the options are.
This both for position determination and attitude determination near the surface without using stars.
This also means that no "cheap" quadcopter which relies on a magnetometer and GPS would be able to fly...
I must give up: trying on the above-mentioned Pentium III machine running Windows 98 in DOS-Mode (so in effect "just" DOS, though I'm not sure which version) yielded the same result:
I have no older system available to try.
I believe he meant that access to the source code for orbiter is now possible so in theory it would be possible to integrate such functionality directly in the core instead of having it be addon-dependent.