Energy Transition / Technology Rock Solid says it has made a good start to 2012US firm Rock Solid Images (RSI), formerly Aberdeen-based Offshore Hydrocarbon Mapping, said today it had made a promising start to 2012. January 18th 2012, 6:20 pm 1 min read Facebook An icon of a facebook f logo. LinkedIn An icon of the LinkedIn logo. Twitter An icon of the Twitter logo. US firm Rock Solid Images (RSI), formerly Aberdeen-based Offshore Hydrocarbon Mapping, said today it had made a promising start to 2012.