CP, the 998 lets you turn nmea 0183 on and off. There are 3 ways to get NMEA 0183 out on HB's the gps has a pigtail that has ground and + for NMEA out of the head unit and + for NMEA out of the GPS puck both at 4800 baud. For the new GPS-HS is 38400 with nmea on. Greg was looking into if the GPS puck NMEA + out got locked to 38400 if connected with Head unit set to NMEA output off for me.
The 3rd way is to buy the AS-HHGS cable and go from the head unit to what nmea device, with less than 6.57 software it is variable baud, I think if it detects AIS attached it locks to 38400.


• Green Wire, GPS NMEA Out
• Black Wire, Ground
• White Wire, Control Head NMEA Out

• If the GPS Receiver/Heading Sensor (AS GPS HS) is connected to
the control head, and NMEA Output is turned on, the control head will
operate exclusively at a baud rate of 38400. If there is an accessory
attached to the Sensor’s pigtail, it also needs to operate at 38400. See
your accessory installation guide to set the baud rate to 38400.
• If a GPS Receiver (AS GR16, AS GR50, AS GRP) is connected to the
control head, and NMEA Output is turned on, the control head will
operate exclusively at a baud rate of 4800. If there is an accessory
attached to the Sensor’s pigtail, it also needs to operate at 4800.