C-95 - AIS 650 GPS conflict

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum JB,

Please note that Class B AIS transceivers are required to utilize their internal GPS receivers in conjunction with a dedicated passive GPS antenna to determine the vessel's position, COG, and SOG which will be used in AIS RF transmissions. Accordingly, the AIS650 is neither designed to utilize GPS data from a SeaTalkng / NMEA 2000 source, nor is the AIS650 designed to transmit GPS data to a SeaTalkng / NMEA 2000 backbone. Correspondingly, the system should not list the AIS650 as a source of GPS data for the system. While ProAIS2 software includes options to output GNSS data, this is limited to transmitting GNSS data via its 38400 BAUD NMEA 0183 port, is defaulted to OFF, and it is recommended that that it remained configured to NOT transmit GNSS data.

Within the system that you specified, there is a single source of GPS (i.e. the c95 MFD) for the remaining devices within the system. In systems featuring a single source of data, the a/c/e/eS/gS-Series MFDs, i70 MFID, and p70/p70R will automatically detect and use data from that source.

As the c95 MFD is the system's source of GPS data for all devices within your system except for the AIS650, the installation location of the MFD is important. Should the installation location of the MFD be such that it does not afford the MFD an unobstructed view of the skies overhead, then it may be necessary to interface an external GPS sensor to the SeaTalkng backbone which has been installed in a location affording it an unobstructed view of the skies overhead. Accordingly, it is recommended that the MFD's installation location be examined and if found to meet the criteria specified within this response. If so and the problem persists, then it is recommended that the MFD be sent to Raymarine’s Product Repair Center to have its internal GPS sensor bench checked / serviced.