Estimated vs Actual Location Icons

I'm working on an application which displays item's location on map. Part of the location are known location - "Actual Location". While other location are - "Estimated location" - may be a wrong location.

I'm looking for an icon (at lest an idea of an icon so I could design it by my self) to display on the map as the item's map Marker.

I need icons for Estimated Location and Actual Location, any ideas?