u-blox8-M8官方资料 Abstract The Receiver Description Including Protocol Specification describes the firmware features, specifications and configuration for u-blox 8 / u-blox M8 high performance positioning modules. The Receiver Description provides an overview and conceptual details of the supported features. The Protocol Specification describes the NMEA and RTCM protocols as well as the UBX protocol (version 15.00 up to 19. 10, version 20.00 to 20.30, version 22.00 and version 23.00 to 23.01) and serves as a reference manual. It includes the Standard Precision GNSS, Time Sync, Time & Frequency Sync, High Precision GNSS, ADR and UDR products.