The Maritime world is in continuous transition. The time to install a Ballast Water Treatment (BWT) System or maybe an Exhaust Gas Scrubber is rapidly approaching. Laser scanning is an important tool in retrofitting. Its ability to rapidly build up precise 3D imagery in the form of Point Clouds has dramatically reduced the time required to take measurements within spaces inside a vessel, as well as increasing the accuracy to two millimeters or less. It can also be used on the outside of the vessel, for example, to check shell side quality or check each block section before they are weld together. An added benefit is that it is simple to use. However, it takes the eye of an experienced engineer to identify the various locations within a space from which the scanning must take place in order to generate a comprehensive, detailed 3D image.