Making a dotted line advance along a path

hi

ok - can you tell, … i am working on an old map.

see working file - here

so i need make a these little paths in the map happen - that show groves of people migrating from the little houses to a specific location. (in scene 4)

i was thinking of making a dotted line that advances, like on cartoons of old treasure maps - (you know, dot dot dot… and eventually you reach the destination.
I would prefer it if the line is not a straight line,. and if i can shape it how ever i want to… but i am open to options.

interested in seeing what you think.

-jeremy
:tb: