| Term | Definition |
| Navigation control unit | | t
| MMI (2nd generation). Equivalent to the control unit for front display and information control panel -J523- (for the basic version) or the navigation system with CD drive control unit -J401- (for the high version) |
| t
| MMI (3rd generation). Equivalent to control unit 1 for information electronics -J794- |
|
| Gyro module | The turn angle sensor is integrated in the navigation control unit. It measures changes in direction of travel and detects rotational movements (gyroscopic compass). |
| Bus versions | MOST bus | | t
| MOST stands for »Media-Oriented Systems Transport« |
| t
| Optical data transfer via fibre-optic cables |
| t
| High-speed data transfer |
|
| CAN bus | | t
| CAN stands for »Controller Area Network« |
|
| LIN bus | | t
| LIN stands for »Local Interconnect« |
|
| TMC | »Traffic Message Channel« is a digital radio data service which is used to transmit information about traffic disruptions to a suitable receiving device. TMC is broadcast in many (but not yet all) countries. |
| GPS | Satellite-based global positioning system for determining location |
| Map matching | Map matching is an algorithm used to determine the most probable position of an object on the map by matching the measured position to the topological information describing the location and geometry of objects on the map. |
