- Speed of Travel
- Spacecraft Drives (Interplanetary Drives or Impulse Drives)
- Starship Drives (Interstellar Drives)
G-Drives are governed by the 10D limit, and are best suited to operation near worlds (or near stars). Beyond the 10D limit, G-Drives operate at 1% efficiency.
ContraGravity drives are not real maneuver drives, and aren't useful outside of a gravity well. Their primary use is Gravcraft. By 10 diameters out from a planet, the ContraGravity drive is virtually worthless. Ships that use ContraGravity still need another form of maneuver drive to get out to jump distance. 
STL Drive Specifications
STL Drive Specifications (Starship Propulsion) Category Specifications Remarks Name TBD TBD Drive Type TBD TBD Velocity TBD TBD Duration TBD TBD Hazards TBD TBD Physical
TBD TBD Geometry TBD TBD Levels TBD TBD Entry TBD TBD Exit TBD TBD Fuel TBD TBD Resource
TBD TBD Inventor TBD TBD Characteristics TBD TBD
The second major breakthrough is artificial gravity. Created by manipulating subatomic forces, artificial gravity is not anti-gravity but is instead a unique force that acts upon the natural gravity field created by all matter. Artificial gravity can be made to either push or pull. Because of its nature, artificial gravity is not a very efficient means of locomotion in deep space where there are no strong gravity wells to push against. 
- Marc Miller. Referee's Manual (Game Designers Workshop, 1987), 56.
- Don Perrin. Starships (Imperium Games, 1996), 71.
- Marc Miller. T5 Core Rules (Far Future Enterprises, 2013), 323-327.
- Traveller Wiki Editorial Team
- Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science