Accuracy of satellite positions from free-ranging grey seals using ARGOS

Abstract. We have undertaken an analysis of the locations derived from an ARGOS system using satellite relay data loggers mounted on free-ranging grey seals (Halichoerus grypus Fab.) in the Gulf of Bothnia, between Sweden and Finland. The accuracy of the classes reported within this study is similar to that reported by Service ARGOS and we suggest that it would be beneficial to receive the A and B location classes. Locations-derived location classes 0 and A can be used for studies involving long-range movements, 10 km or more, but would not be suitable for fine-scale analyses.