Fig. 4

Estimated pop-up location (yellow circles) for PSATs deployed at fixed positions in Bristol Bay, Alaska, including mrPATs (2020 and 2021, a) and MiniPATs (2021, b). Corresponding first high-quality Argos location estimate (teal circles) and tag’s fixed deployment position (red stars) are shown as reference points along with drift error (solid lines) and estimate error (dashed lines). Light-blue ellipses are Argos-estimated 63% error ellipses and purple ellipses are composite 95% error ellipses based on all Argos-estimated error ellipses associated with drift locations used to estimate pop-up location