Software to move graphics over another. i.e. a bus over a map I want to portray the tour of a group of students from the Uni to an exterior site and back.
The idea ist to have a map (static or scrolling) and move a picture of a bus on it.
The look is supposed to resemble a cut out bus being moved of a paper-map.  

I am looking for a suitable (free) software to do this.
I am also open for other suggestions to achive that effect.
You could try stop-motion. Basically your taking a pic of the bus everytime you move it on the map, then putting it together as a sequence in your editing program. Bout the only free way I can think of