 In addition to these problems, collaborative maps must deal with the difficult issue of cluttering, due to the geometric constraints inherent in the media.One approach to this problem is using overlays, allowing to suitable use in consumer services.Despite these issues, collaborative mapping platforms such as OpenStreetMap can be considered as being as trustworthy as professionally produced maps

Overlays group together items on a map, allowing the user of the map to toggle the overlay's visibility and thus all items contained in the overlay.