I was just working on this. I think this is why ESRI sells tracker analysis. HOWEVER, There is a work around for those that don't have it. Work around #1. I created a list widget, sorted descending on OBJECT ID, limited the list to one entry. Then on the widget configuration I included zoom, highlight, and directions too. Work around two I haven't actually done yet, but I would do about the same thing only with a filter. Hope this helps, I know it doesn't get rid of all the map clutter but at least one can find where their last location is. Another item under the configuration settings that I haven't played with yet is there is a "Follow" feature, I'm interested in how that will work.