The Type-S Scout/Courier fulfills one of the most basic requirements of any interstellar organisation – be it a government, commercial entity or military force. It is first and foremost a low-cost messenger ship, and although it does have some additional features its overall capabilities are limited by the need to provide an interstellar communications capability at as low a price as possible.
Referee's Aid 2: The Type-S Scout/Courier provides an indepth look at one fo the most common ships in Known Space, along with its variants. It walks yo uthrough every aspect of the Scout, with all new 3D deck plans, and provides specific vessels to be used in encounters.
If you are looking to flesh out the ship many players start with, look no further.