| bearing | Bearing between geographical locations | 
| bearingTrack | Bearing between geographical locations | 
| dist.next | Internal function for package argosfilter | 
| dist.prev | Internal function for package argosfilter | 
| distance | Great circle distance between geographical coordinates | 
| distanceTrack | Great circle distance between geographical coordinates | 
| distance_m | Internal function for package argosfilter | 
| internal.angles | Internal function for package argosfilter | 
| radian | Degrees to radians | 
| sdafilter | Filter Argos locations | 
| seal | Satellite tracking data from a ringed seal | 
| vmask | Filter locations for speed |