SC/58/RMP5 Estimating measurement errors in distance experiments

This paper discusses the advantages and drawbacks of radar and gps as reference points for estimating measurement error for visual observations of marine mammals during line transect surveys with reference to the distance and angle experiments as conducted during the Norwegian minke whale sightings surveys. Radar and gps give very similar and consistent results but the convenience of the gps method makes it preferable to using the radar as a calibration reference