Explanation
Invalid measurements are indicated by a status word value of 0000 and occur when the Rex2 cannot reliably detect a sea-surface echo.
Common causes include obstructions within the radar beam, poor antenna alignment, excessive measurement range, or static reflective surfaces.
Corrective actions typically include cleaning the antenna, improving alignment, or reviewing configuration parameters such as reference height and hold-off distance.
The Spectra Graph should be used to diagnose the underlying cause before further troubleshooting.