A courier is a small hyper-capable vessel. Couriers are mostly used for the transportation of information. They occasionally carry one or two passengers that need to travel quickly. They are similar to military dispatch boats.
Use in TRMN
In The Royal Manticoran Navy: The Official Honor Harrington Fan Association, Inc. (TRMN), a courier is a chapter type available for the Royal Manticoran Merchant Marine. The smallest hyper-capable merchant ship chapter, the minimum crew size is 3, of which one must hold a licenses as Master. A courier can have a maximum crew of 10 and can carry 2 passengers.