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Installed as early as 2151 for NX-class starships, the main viewer aboard these vessels provided a wide screen view of the space around the ship, as well as visual communications. Computerized and processed data, such as speed and schematics, could be projected or combined with the view. Rectangular in shape, the window provided a wide screen view of the exterior space before the ship.
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Installed aboard early Starfleet vessels including Freedom-class starships, the viewscreen was a rectangular window located on the front bulkhead of the main bridge.
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The main viewscreen aboard the USS Franklin. ( Star Trek VI: The Undiscovered Country TNG: " The Survivors", " The Bonding" ENT: " Broken Bow") The image could also be augmented, with the ship's computer displaying extrapolated images or graphics displaying sensor data. When necessary, the image on the viewscreen could be magnified - 24th century starships easily gaining a magnification of 10 6. ( Star Trek V: The Final Frontier Star Trek TNG: " Encounter at Farpoint", " Who Watches The Watchers", " Ship in a Bottle" DS9: " For the Uniform", " What You Leave Behind" VOY: " The Cloud") Intra-ship communications were also possible, though the main viewer was rarely used for this function. Visual contact, however, could only be achieved when in visual range. It was also essential in ship-to-ship communication, allowing face-to-face conference if so desired, utilizing subspace and other communications systems. Typically used to display images of the area immediately around or in front of a starship, the viewscreen could provide views from all directions, as well as call up data from the library computer. The viewscreen aboard the USS Enterprise-D with a targeting reticule, 2364 Generally consisting of a large screen or window located on the bridge of a starship (or operations center of a space station or starbase), the viewscreen was an almost universal facet of space exploration and colonization dating as far back as the 22nd century, surviving well into the 23rd and 24th centuries. The viewscreen aboard the USS Enterprise displaying red alert status in the 2270s