The article presents the analysis of accuracy position defining of sea infrastructure objects using high-resolution satellite imagery. The analysis bases on defining co-ordinates of objects using large-scale maps (field measurements) and their comparison to co-ordinates reading on processed satellite imagery. The article presents the author’s method of location precision enlarging on satellite imagery through additional imagery data support (geodetic and cartographic). Results of conducted analysis define accuracy of object’s location on satellite imagery and are related to the possibility of using these images to large scale cartographical studies