| Abbreviation | Description |
| WGS 84 | World Geodetic System 1984 |
| GPX | GPS Exchange (format) |
| Landmark | A landmark is a named object that contains a location. The location can be defined by various attributes, e.g. WGS 84 coordinates or a textual address. |
| Landmark category | A landmark can be categorized by assigning a landmark category to it. A typical landmark category is “Restaurant”. |
| Landmark database | Persistent storage of a collection of landmarks and landmark categories. |