Blom Geomatics of Norway has added a fourth Piper PA31 to its fleet. It will carry updated survey equipment that will facilitate the production of 3D maps. Md Jon Wold said that the Piper PA31 was a stable aircraft and could carry extra tanks of fuel that enabled it to stay in the air for seven hours. Blom Geomatics started operations under a different name 21 years ago with just one aircraft.