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8.2. Measurement Quality Checks

The Compass button may be colored or inactive based on the following ADQA checks.
 
Inactive
 
Check—The data loaded does not have valid heading data, such as from a StreamPro with no compass.
 
Good (Green)
 
Check—A compass calibration and evaluation were completed OR the ADCP has a compass that was not calibrated but calibration is not required because neither a loop test nor the Global Position System (GPS) are used.
Check—Pitch and Roll passed all QA thresholds.
 
Caution (Yellow)
 
Check—GPS data or the loop test is present, a compass calibration was completed but there is no compass evaluation.
Message—Compass: No compass evaluation.
 
Check—Magnetic variation is not consistent for all transects.
Message—Compass: Magnetic variation is not consistent among transects.
 
Check—Mean pitch for transect > 4 degrees.
Message—Pitch: One or more transects have a mean pitch > 4 deg
 
Check—Mean roll for transect > 4 degrees.
Message—Roll: One or more transects have a mean roll > 4 deg
 
Check—Standard deviation of pitch for transect > 5 degrees.
Message—Pitch: One or more transects have a pitch std dev > 5 deg
 
Check—Standard deviation of roll for transect > 5 degrees.
Message—Roll: One or more transects have a roll std dev > 5 deg
 
Check—Pitch within compass calibration limits (SonTek G3 compass only)
Message—Compass: One or more transects have pitch exceeding calibration limits
 
Check—Pitch within compass calibration limits (SonTek G3 compass only)
Message—Compass: One or more transects have pitch exceeding calibration limits
 
Check—Roll within compass calibration limits (SonTek G3 compass only)
Message—Compass: One or more transects have roll exceeding calibration limits
 
Check—Change in magnetic field strength compared to calibration exceeds 2%  (SonTek G3 compass only)
Message—Compass:  One or more transects have a change in magnetic field exceeding 2%
 
Warning (Red)
 
Check—GPS data or the loop test is present and there is no compass calibration.
Message—COMPASS: No compass calibration.
 
Check—GPS data are recorded and the magnetic variation is zero.
Message—COMPASS: Magnetic variation is zero and GPS data are present.
 
Check—Mean pitch for transect > 8 degrees.
Message—PITCH: One or more transects have a mean pitch > 8 deg
 
Check—Mean roll for transect > 8 degrees.
Message—ROLL: One or more transects have a mean roll > 8 deg