> Is there a possibility to prove if any number of locations (markers)
> are on a specific direction?
> Example: I want to go from A to B. Anywhere I've stored some special
> locations to look for and I want to see if this locations (points) are
> on this direction? If they are they should be shown otherwise not.

Get the polyline representing your route from A-B.
Check each of your points for the distance from the polyline
Decide for yourself what is close enough - one kilometre, one
nanaometre? - and display the points you want.

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