| No GNSS position detected |
Receiver harness disconnected |
Verify GNSS receiver harness connections |
| No GNSS position detected |
Receiver not powered |
Verify GNSS receiver/display powers on correctly |
| No GNSS data after startup |
Receiver still initialising |
Allow receiver sufficient time to initialise and acquire satellite lock |
| Receiver powers on but no data detected |
Incorrect receiver output connection or configuration |
For NMEA 2000 receivers, verify connection to the correct CANBUS port operating at 250 kbps. For NMEA 0183 receivers, verify the correct serial output port and baud rate are configured and connected |
| Receiver powers on but no data detected |
Incorrect RS232 baud rate configuration |
For NMEA 0183 receivers, verify the configured serial baud rate matches the Level COMMAND receiver configuration |
| Receiver powers on but no data detected |
Incorrect CANBUS connection or baud rate |
For CANBUS/NMEA 2000 receivers, verify the receiver is connected to the correct CANBUS network operating at 250 kbps |
| Receiver powers on but no data detected |
NMEA output messages not enabled |
Verify required NMEA output messages are enabled within the receiver/display configuration |
| Position updates slowly |
Low output rate configured |
Configure receiver output rate to minimum 5 Hz; 10 Hz recommended |
| No RTK corrections |
Incorrect base station selected |
Verify the implement receiver is connected to the intended base station or correction source |
| No RTK corrections |
Base station not transmitting corrections |
Verify base station operation and correction output |
| No RTK corrections |
Incorrect base station configuration |
Verify base station radio/modem and correction output configuration |
| No RTK corrections |
Incorrect implement receiver configuration |
Verify correction source, radio/modem and RTK settings within the implement receiver |
| RTK intermittently lost |
Poor correction radio signal |
Inspect correction antenna placement and cable condition |
| RTK intermittently lost |
Excessive distance from base station |
Reduce distance to base station or verify correction coverage |
| RTK intermittently lost |
GNSS quality thresholds configured too aggressively |
Verify Level COMMAND GNSS requirement settings are suitable for current operating conditions |
| Poor accuracy or drifting |
Low GNSS correction quality |
Verify RTK/DGNSS correction status |
| Poor accuracy or drifting |
Multipath or obstructed sky view |
Move machine to open sky area clear of obstructions |
| GNSS accuracy degraded unexpectedly |
Receiver operating in Float/DGNSS mode |
Verify RTK Fix status before operation |
| Position intermittently lost |
Damaged harness or loose connector |
Inspect GNSS harnessing and connectors |
| Position quality degraded |
Receiver firmware outdated |
Verify GNSS receiver firmware is up to date |
| Position appears offset |
Incorrect base station coordinates |
Verify configured base station coordinates |
| Position appears offset |
Connected to incorrect base station |
Verify the implement receiver is connected to the correct base station |
| Position appears offset |
Incorrect receiver offsets configured |
Verify receiver height, fore/aft and lateral offsets within Level COMMAND |
| Cross-slope or terrain response incorrect |
Incorrect IMU or receiver assignment |
Verify GNSS and IMU configuration within Level COMMAND |
| Terrain compensation inaccurate |
TCM/IMU calibration not completed |
Perform TCM/IMU calibration according to manufacturer instructions |
| Terrain compensation inaccurate |
Incorrect machine orientation during calibration |
Perform calibration on level ground away from vibration |
| Terrain compensation unstable |
IMU mounted on flexible surface |
Mount IMU to a rigid surface isolated from excessive vibration |
