A critical component supplied with the continuous DeviGyro is the optical depth encoder, the DeviCounter. The Devicounter is attached to the drill rig wireline, recording time and depth, whilst the DeviGyro records time and navigation data. After surveying is completed the two sets of data are merged.
Unlike some counter systems the DeviCounter stores the depth data internally, correcting errors prior to merging.
The DeviGyro can also be run in manual mode where a depth interval is manually entered, for example when using a fibre glass rodder or polypipe.