How to split a GPS route into equal parts?

Question

satellite navigation

The bottom line is that there are two points A (beginning) and B (end), the length of the route from A to B = 100 km, in the middle of the route you need to put point C.
I drew a straight line, for this there is a functional and crushed it in half and into several equal parts but this is not suitable because the route may not be perfectly even, you need the middle exactly along the laid route

Here is an example made through Google maps with polylines but this is not quite right - yarema.fun