I am not 100% sure of the name, but a friend of mine was telling me that it is actually an industry term for navigation systems called "breadcrumbs". Its a feature that shows you where you have been in case you need to back track for whatever reason. Yes, much like Hanzel and Gretel story.
But the white dots on the map really aren't that helpful unless you zoom in all the way and try to follow them down EVERY street. If it actually kept a list of what roads you were on I could see that being useful.
And pac man, ahahaha. That would be awesome.