True Heading (0x13,0x31)
| Description | 
 | |
| Notes | ||
| Parameter Name | Data Type | Description | 
| Field Length | u8 | 13 | 
| Descriptor | u8 | 0x31 | 
| Time | Time | Timestamp of the measurement. | 
| Frame Id | u8 | Source ID for this estimate (source_id == 0 indicates this sensor, source_id > 0 indicates an external estimate). | 
| Heading | float | Heading [radians]. Range +/- Pi. | 
| Uncertainty | float | Cannot be 0 unless the valid flags are 0. | 
| Valid Flags | u16 | |