Last month, Malcolm Hughes was instructed to carry out a detailed Ground Penetrating Radar survey of Inverness Castle to detect rabbit burrows. Due to the shape of the survey area, scans were logged with GNSS to provide accurate geo-positioning. Radar is an excellent method of detecting subsurface anomalies. The burrows themselves were detected in the form of voids under the surface which were identified during post processing. The findings of the survey was used to assess overall ground stability.