IIRC they show the dots.
I can say for certain this did work, five years ago when I posted it. Now 
. Assuming Google hasn’t changed its API it should work. Unfortunately I’m pretty sure the API has changed so I don’t know if this is possible anymore using the same approach.
But you should be able to use a starting point and an end point and waypoints to plot where you’ve been. You just need to save all the points and write the code that will pass these to the URL to pull the map. See Embedded Google Maps Widget and Embed a map | Maps Embed API | Google for Developers for and example and details.
You will still need a rule to clear the history and a rule to keep track of the start, stop, and waypoints and format the data so the states of the Items can be used in the URL to Google Maps.