The German Research Centre for Geosciences (GFZ) has been actively continuing its gravity campaigns in the Baltic Sea within the framework of the FAMOS project since 2014. GFZ contributes this multidisciplinary project in joint shipborne campaigns together mainly with BKG and BSH. In practice, the cost of gravity campaigns is often a handicap and prevents researchers to implement campaigns dedicated to gravity measurements only; therefore, some gravity campaigns became part of the FAMOS project where gravimeters were installed piggy-back on vessels sailing on occasion across regions of interest. In this context, GFZ performed two ferry campaigns in the Baltic Sea on agreement with the shipping companies Stena Line and Finnlines. The nature of such campaigns is particularly different than the dedicated campaigns and requires practical solutions in the field tasks and adopted data processing. In this study, we present the measurements collected in the field both on land and off shore areas and the investigations on the effect of the kinematic vertical and dynamic (horizontal) acceleration corrections to the final products. The outcome of the two campaigns approves the good-quality marine gravity measurements on ferries and applicability of Chekan-AM measurements in non-dedicated campaigns along very long-tracks.