Methods and systems for excess path length corrections for gnss receivers

A data processing system comprising:

• a set of one or more communication transceivers coupled to one or more networks;
• a processing system coupled to the set of one or more communication transceivers;
• one or more data storage devices coupled to the processing system, the one or more data storage devices storing an excess path length (EPL) correction database created through crowd sourced EPL corrections from a set of systems that each include a global navigation satellite system (GNSS) receiver, the EPL correction database partitioned into bins, with each bin associated with a GNSS satellite's (SV's) position in a representation of a sky above a set of one or more approximate locations such that the bins collectively cover the representation of the sky for the set of one or more approximate locations;
• the processing system receiving, from the set of one or more communication transceivers, a request for EPL corrections for a received approximate location from a GNSS system, and the processing system looking up, in the EPL correction database, a set of one or more EPL corrections based on the received approximate location from the GNSS system, and the processing system causing the set of one or more communication transceivers to transmit the set of one or more EPL corrections to the GNSS system.