Fig. 7

Trip direction. The categorical variable (Direction) was defined as the major movement direction with respect to the previous and next haul-out sites (black vertical bands). The distance from the last and to the next haul-out sites (respectively solid and dashed line) was calculated for each trajectory location (a). The difference between successive distances was then computed and averaged across a running window of 6 h (b). Trip segment limits were defined when average difference distance crossed zero (grey line in b). ‘Outward’ (medium dark grey bands) and ‘inward’ (light grey bands) trip segments were identified as the segments respectively starting and ending within 2 km from the last or next haul-out site (grey line in a). The Direction category ‘Other’ (dark grey bands) was identified by exclusion (see Methods). The approach used was able to identify multiple return trips to the vicinity of haul-out sites between two haul-out periods. Data shown are for individual pv30-01-09 during a selected period of time