Car and Driver magazine reported on this event, dubbing the rover a 'Mars Car' and noting the designers and various specifications of the vehicle, such as its size. An example of an in-house NASA design for rover is the wheeled version of the Space Exploration Vehicle, which has a version for outer space. An early version of the SEV rover was tested in 2008 by NASA in the desert. The SEV for space or roving missions was designed to support two humans for 14-days, and would include a toilet, sleeping logistics, and one version has suitports to support EVAs. Another concept is a windows that allow looking at objects very close to the front of the rover but on surface (down and to the front). Navigation For options for keeping track of location as the rover moves around Mars include: Topographic cues from images Inertial measurements (see also Inertial measurement unit) A Mars GPS if emplaced Celestial navigation Navigation on Mars is noted as important issue for human missions to the planet. Celestial navigation, used for over 500 years on Earth, may provide a way of locating on the Mars surface to within about 100 meters (109 yards). Navigation is especially relevant to rovers, because they need to know at least roughly where they are and where they are going to get to a destination. Dead reckoning was the method used by the Mars Pathfinder rover Sojourner for navigation. A GPS satellite network for Mars would mean a constellation of satellites in Mars orbit, but one alternative would be a surface based pseudo-satellites array. These devices would have to be emplaced with high precision, unless they were self-calibrating. Rover design An example of criteria for a crewed Mars surface rover was expressed by NASA in the surface variant of the aforementioned SEV, in development during the 2010s. The 1980s era "Case for Mars" design suggest a medium-range rover with two compartments, one which could be depressurized and opened up to the Mars atmosphere, and a driving compartments which could remain pressurized during this time. The same study also suggested a bigger, long-duration rover with tracks and robotic arms, in addition to other types in that crewed Mars mission concept. Airlock design, especially for EVA, is an area of study for pressurized rovers. Design ideas for crewed and/or pressurized rovers: Docking hatch – a docking hatch would allow the rover to