![]() ![]() But it is also possible that GNSS integrity is always at 0. My concern has been to find an equivalence for the field “Data Valid” of these 6 sentences that I mentioned, which is the only one existing for versions of NMEA0183 prior to specification 3.0, and I thought it logical to think that a 0 in the GNSS integrity field corresponded to that “Data Valid” because I detected it together with “Position Fix” in GNS Method. It seems that this field does not have a useful translation to the sentences: GLL, RMA, RMC and the derivatives for the calculations in navigation: APB, RMB, XTE. Looking in different sources I have observed the coincidence with the documentation of Maretron, and of course, it says the same in pgn.h “GNSS integrity” starts at message bit 256, this is byte 32. I apologize, I had an error in the byte count. This information has also been verified in the files of the CanBoat project: candumpSample1.txt and candumpSample2.txt The captures were made with a logical analyzer. 9: Integrity – This field always contains a value of 0 (no integrity checking).ĭata field (from 0, byte 30, bits 0 and 1) in PGN 129029 sent from a Raymarine A-series multifunction screen. ![]()
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