A method for sending environmental data to a vehicle in transit is disclosed. The method is performed by a ground system. The method includes receiving new environmental data from a plurality of environmental data providers. The method also includes synthesizing an update template that identifies recommended portions of relevant data that are available to be uploaded for at least one of a plurality of environmental data services. The method also includes sending the update template to the vehicle using a low-bandwidth connection, wherein the update template is sent by the ground system without first receiving a request for the update template. The method also includes receiving, from the vehicle, a request for the recommended portions of relevant data. The method also includes sending the recommended portions of relevant data to the vehicle in an update package using a high-bandwidth connection.