Well I always likes mathematics, but actually never needed it that bad in my work career. Now I am doing my own project with a running site, and need to learn – or just brush up – some math. Eg. I want to get more hold on vectors to do calculations with GPS coordinates.

I need to calculate when crossing a line (like a start or finish line). And then calculate (by interpolation?) the parts on each side of the line. This to be able to calculate distance and time for a given route.
So now I have a good excuse to study more math!