![]() ![]() 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. For ultimate performance the AIS-2-2000 uses a dedicated VHF antenna or can share the boats existing VHF Antenna using the Comar ASR 100 Antenna splitter which will ensure AIS reception and VHF reception simultaneously whilst priortising the VHF/DSC radio when transmitting.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.Unlike many AIS receivers that claim to be dual channel the AIS-2-NMEA is a true parallel AIS receiver, ensuring that you receive the most up to date positions and information of all vessels around you.Two AIS receivers monitor both AIS channels simultaneously.The AIS targets together with all the static and dynamic information received is displayed on any compatible Chartplotter or Radar connected to the NMEA 2000 network. The AIS-2-2000 reads and decodes all AIS messages that are specified and transmitted by AIS Class A and Class B transponders. ![]()
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