Get the turning angle between points.
wat_turning_angle(data, x = "x", y = "y", time = "time")
| data | A dataframe or similar which must have the columns
specified by   | 
    
|---|---|
| x | The x coordinate.  | 
    
| y | The y coordinate.  | 
    
| time | The timestamp in seconds since the UNIX epoch.  | 
    
A vector of turning angles in degrees. Negative degrees indicate 'left' turns. There are two fewer angles than the number of rows in the dataframe.