Geo3o1 is a Matlab tool for 3D georeferencing accuracy retrieval for Pleiades 1A/1B/Neo, SPOT 6/7 and Gokturk-1 stereo or triplet primary panchromatic images. Even though the orientation model was settled by the image providers, the main contribution of Geo3o1 is the two-stage adjustment computation. Moreover, exterior orientation parameters' efficiency and validation, and also the correlation between interior and exterior orientation parameters could be analysed. Geo3o1 is capable of processing stereo or triplet images. The case study was handled with the panchromatic primary triplet images of Pleiades 1A. 171 points measured by GNSS observations were used. The accuracy on the ground was estimated at the centimetre level for GCPs, while the accuracy for ICPs was naturally coarser at similar to +/- 1 GSD in bundle adjustment. The external orientation parameters' effectiveness and validation, and co- and cross-correlations were also investigated. The test site covers a hilly, mountainous area in Zonguldak, Turkiye.