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In Star Trek - What's the Point of the Transporter Room?

If transporters can beam people directly from site-to-site (i.e.: straight from the surface of a planet to the bridge (as seen in STNG S3-E3, "The Survivors", and other episodes), why is a dedicated transporter room and pads required aboard a starship?

marked as duplicate by Izkata, Kevin, DVK-on-Ahch-To, Xantec, PearsonArtPhoto Apr 30 '12 at 12:33

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I recall something about energy utilization. Most efficient was a pad-to-pad transport, less efficient was non-pad to pad (or vice-versa) and least efficient was non-pad to non-pad. Wish I could tell you where I came across this but can't :( Think it was in a TNG episode but can't swear to it.

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