Estimated parameters for PSAT tags analyzed with UKFSST and associated mean speeds from the predicted most probable track (MPT).

Directed movement parameters (u and v) expressed in nm day−1; diffusion estimate (D) in nm2 day−1; error estimates of longitude and latitude (σx and σy) in degrees; smoothing radius (r) in nm. Negative log-likelihood values (Log L) are a measure of the model’s fit (smaller value = better fit). Values of 0 (for u and v) indicate models in which those parameters were not active. Values of 0.1 (for σx) and 1 (for σy) indicate models in which those parameters assumed UKFSST default values. Smoothing radius (r) was fixed, with the exception of Shark 35, to optimize the model’s fit. Reynolds Optimally Interpolated SST was used as the SST field in all cases.