E/V Nautilus conducts multibeam mapping surveys to create accurate bathymetric maps for science and for remotely operated vehicle (ROV) navigation. In addition, the ship collects bathymetric data during transits between ROV dive locations in previously unmapped areas that may lead to opportunities for future exploration. Between 2013 and 2015, Nautilus mapped over 211,355 km² of seafloor in the Mediterranean, Atlantic, Caribbean, Gulf of Mexico, and eastern Pacific regions. Nearly 87,000 km² were collected in 2015, due in large part to two long-distance transits from Galveston, TX, to the Galápagos, and from the Galápagos to San Diego, CA.