1. A method of distributing map correction data, comprising: aggregating and categorizing, at a server, received public map corrections, wherein the categorization includes at least analyzing the received public map corrections in terms of the source from which the public map corrections were received, and assigning at least one source category to map corrections received from sources having a particular trustworthiness into a plurality of categories; and distributing, by the server on request, categorized map corrections to a client.