| Macro | Description |
| RTDATACHANGE_DISTANCE | These flags are bit masks that can be used to determine which types of data have changed. |
| RTDATACHANGE_FIXTYPE | These flags are bit masks that can be used to determine which types of data have changed. |
| RTDATACHANGE_HEADING | These flags are bit masks that can be used to determine which types of data have changed. |
| RTDATACHANGE_POSITION | These flags are bit masks that can be used to determine which types of data have changed. |
| RTDATACHANGE_QUALITY | These flags are bit masks that can be used to determine which types of data have changed. |
| RTDATACHANGE_SPEED | These flags are bit masks that can be used to determine which types of data have changed. |
| RTDATACHANGE_TIME | These flags are bit masks that can be used to determine which types of data have changed. |
| RTENGINE_VERSION | RTEngine Version 2.01 |