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10.2 | GNSS & Position Issues

Issue

 Possible Cause Recommended Action
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

Receivers with Terrain Compensation

Issue Possible Cause Recommended Action
Cross-slope or terrain response incorrect Receiver-integrated TCM not calibrated Perform TCM calibration according to receiver manufacturer instructions
Cross-slope or terrain response incorrect TCM disabled within receiver configuration Verify TCM functionality is enabled within the GNSS receiver configuration

Receivers without Terrain Compensation (Cross-slope sensor required)

Issue Possible Cause Recommended Action
Cross-slope or terrain response incorrect Sensor offsets not enabled Verify sensor offsets are enabled within Level COMMAND
Cross-slope or terrain response incorrect Incorrect sensor offsets configured Verify IMU position offsets are correctly measured and configured within Level COMMAND
Cross-slope or terrain response incorrect Incorrect IMU assignment or configuration Verify the correct IMU source is configured within Level COMMAND
Terrain compensation unstable TARS IMU mounted incorrectly Verify IMU mounting orientation and mounting rigidity
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