| Localization produces large errors | |
| Cause | Solution |
| A typographical error occurred | If errors are 10s or 100s of feet or meters, it is likely that a typographical error has occurred. If coordinates were manually entered, check longitudes are correctly prefixed with a minus sign if working in the western hemisphere (e.g., USA). Re-enter the coordinates. |
| The range-pole was unsteady | If the errors are decimeter level in magnitude, it may point to either inaccurately measured local site coordinates or not holding the range-pole vertical when measuring the GNSS coordinates |
| Inaccurate local site coordinates or erroneous GNSS measurement | If error values of the first few points are reasonable but increase when a new point is measured, the point just measured must have either inaccurate local site coordinates or erroneous GNSS measurement. To isolate the error, disable horizontal and/or vertical localization for each control point in turn and observe the set of errors. When the errors become acceptable due to certain isolation, the point isolated is most likely to detract from the quality of the localization. As a general rule, if error values of the first few points are reasonable but increase when a new point is measured, the point just measured must have either inaccurate local site coordinates or erroneous GNSS measurement. Once a problematic control point is found, re-measure the point again to see any improvement can be gained. If it is still suspect and affects the acceptable tolerance, the horizontal and/or vertical localization for this point may be disabled. |
| There are no H.Error and V.Error values | |
| Cause | Solution |
| “Use for horizontal GNSS localization” and/or “Use for vertical GNSS localization” check boxes may not have been selected. | These check boxes need to be selected for a minimum of three points. Note that the error value will be calculated once three Control Points are measured and used for the GNSS localization. |
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