NMEA 2000 PGN InformationCCUType PGN DescriptionTransmit andreceive059392 ISO acknowledgment059904 ISO request060928 ISO address claim126208 NMEA: Command/Request/Acknowledgegroup function126464 Transmit/Receive PGN list group function126996 Product information127257 Transmit/Receive attitude data127251 Transmit/Receive rate of turnTransmit only 127250 Vessel headingReceive only 127258 Magnetic variation127488 Engine parameters: Rapid update128259 Water speed129025 Position: Rapid update129026 COG & SOG: Rapid update129283 Cross track error129284 Navigation data130306 Wind dataHelm ControlType PGN DescriptionTransmit andreceive059392 ISO acknowledgment059904 ISO request060928 ISO address claim126208 NMEA: Command/Request/Acknowledgegroup function126464 Transmit/Receive PGN list group function126996 Product informationTransmit only 128259 Water speed129025 Position: Rapid update129026 COG & SOG: Rapid update129283 Cross track error129284 Navigation data129540 GNSS satellites in view130306 Wind dataReceive only 127245 Rudder data127250 Vessel heading127488 Engine parameters: Rapid update128259 Water speed129025 Position: Rapid update129029 GNSS position data129283 Cross-track error129284 Navigation data129285 Navigation: Route/Waypoint information130306 Wind data130576 Small craft statusNMEA 0183 InformationWhen connected to optional NMEA 0183 compatible devices,the autopilot uses the following NMEA 0183 sentences.Type SentenceTransmit hdmReceive wplggaType SentencegrmegsagsvrmcbodbwcdtmgllrmbvhwmwvxteError and Warning MessagesError Message Cause Autopilot ActionECU Voltage is Low The pump supply voltagehas fallen below 10 Vdcfor longer than 6 seconds.• Alarm sounds for5 seconds• Continues innormal operationAutopilot is notreceiving navigationdata. Autopilot placedin Heading Hold.The autopilot is no longerreceiving valid navigationdata while performing aRoute To maneuver.This message alsoappears if navigation isstopped on a chartplotterbefore the autopilot isdisengaged.• Alarm sounds for5 seconds• Autopilottransitions toheading holdConnection withAutopilot LostThe helm control has lostconnection with the CCU.N/ALost Wind Data(sailboat only)The autopilot is no longerreceiving valid wind data.• Alarm sounds for5 seconds• Autopilottransitions toheading holdLow GHC™ SupplyVoltageThe supply voltage levelhas fallen below the valuespecified in the lowvoltage alarm menu.N/AError: ECU HighVoltageThe pump supply voltagehas risen above 33.5 Vdc.• Alarm sounds for5 seconds• The ECU shutsdownError: ECU Voltagehas Dropped RapidlyThe ECU voltage hasdropped quickly below7.0 Vdc.• Alarm sounds for5 seconds• The error iscleared when theECU voltagerises above7.3 Vdc.Error: ECU HighTemperatureThe ECU temperature hasrisen above 100°C(212°F ).• Alarm sounds for5 seconds• The ECU shutsdownError: LostCommunicationBetween ECU andCCU (when theautopilot is engaged)Communication betweenthe CCU and the ECU hastimed out.• The helm controlbeeps, andautopilottransitions tostandby.Registering Your DeviceHelp us better support you by completing our online registrationtoday. Keep the original sales receipt, or a photocopy, in a safeplace.1 Go to garmin.com/express .2 Sign in to your Garmin account.10