A format for providing messages among GNSS apparatus includes providing a message identification block and a message body. The message identification block includes information specifying a message length and a message type block specifying a message type. Rather than sending all data from one apparatus...http://www.google.co.uk/patents/US20100085249?utm_source=gb-gplus-sharePatent US20100085249 - Compact Transmission of GPS Information Using Compressed Measurement Record Format
