The MapQuest Observer API allows clients to receive GPS observations generated from mobile applications using the MapQuest Tracking SDKs on a second by second basis. It provides a way for clients to curate the stream of information by defining predicates expressed as query parameters. This streaming service can render data in a variety of formats. Parameters are available to perform filtering on attributes such as location and speed. MapQuest is a location-enabled Geospatial solution that provides tools for mapping items such as reservations, recommendations to routes, reroutes and more.