Ok. My Google Earth has inexplicably stopped crashing, so I've began plotting on it.
Here is my current version (lifetime 5 days; Me, Sicon and Qara on the map), assuming I've saved it properly - I'm not sure about that.
Now, the problems with the globe:
- The Earth is round (duh), which is why the directions are mostly my estimation. I have no idea how to plot them properly.
- The Earth is not exactly round. I see that Google Earth accounts for that by using not-quite-square grid, and I have no idea whether to take it into consideration. And, mind you, that influences the results greatly. If we used a physical globe, we sure would have to treat it as completely round.
- I haven't found a "line in the direction" function in Google Earth. It sure would make it much easier.
- The lines on the globe are plotted in some weird manner (OK, I know that it's geometrically correct, but whatever). The problem is with horizontal lines (W / E). I have to choose between the line looking actually straight at the start, and making it go parallel to the grid (in that case it bends in a weird manner).
In short, I still think I'm going to fail on this one. Too many assumptions. Also, I can only use Google Earth at home, which, in the next couple of days, boils down to an hour or so per day. Somebody neeeds to Take Up My Sword if we are limited by time.
On the bright side, Google Earth allows to hide the lines in an arbitrary manner. I've sorted them by folders, so we can show/hide the same lines in a single click. Convenient. ^_^