bearing                 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
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
