That was a really good tip from you. I recently had a little bit of spare time and looked into PinchMap used by FourSail. With some slight modifications it is now doing most of the things I want. However there is one thing I don't even know how to start with. It's track lines. The only idea I have right now, is to draw a qml image with a small dot on every track coordinate. But that's thousand of images, I don't know if that makes sense. May I ask how you did that in modRana?