[CA] [CA11] AIS650 NMEA Issues

[Chuck - Raymarine - Moderator]

Graham,

Q1. Provide position to my Raymarine VHF and an icom 802 SSB. I am assuming this needs to be at 4800.
A1. Indeed, these devices require that GPS data be received from a 4800 BAUD NMEA 0183 data source. All NMEA 0183 transmissions include a two character Talker ID which identifies the type of product from which the transmission was sent. The AIS650 correctly transmits the "AI" Talker ID to indicate that the source device was an AIS transceiver. Unfortunately, many ICOM products will only accept GPS data from a 4800 BAUD NMEA 0183 source which transmits the "GP" Talker ID. In such cases, the solution specified within the FAQ found here is recommended.

Q2. Provide AIS data to a Digital Yacht AIS Lifeguard MOB Alarm at 38400.
A2. Given this requirement, it would be recommended that the solution specified above to provide GPS data to the ICOM communications products be utilized. It would then be recommended that the AIS650's 38400 BAUD output lead be disconnected from the AIS650's 38400 BAUD input leads and the the AIS650's 38400 BAUD NMEA 0183 output leads then be interface to the Digital Yacht AIS Lifeguard MOB Alarm. Unlike 4800 BAUD NMEA 0183 communications which is commonly paralleled to provide data to three or four NMEA 0183 listeners, it is not recommended that 38400 BAUD NMEA 0183 communications be paralleled, as it often yields unreliable communications.