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Hi, I’m using FlightR 0.4.7 to analyse geolocation from Arctic-nesting birds. Because my study site is located above the Arctic circle, I did a rooftop calibration in the “south” prior to the field season. This works well and the make.calibration function gives good estimates. > Calibration.periods<-data.frame( + calibration.start=as.POSIXct("2016-05-07"), + calibration.stop=as.POSIXct("2016-05-17"), + lon=-68.21627, lat=48.57245) > print(Calibration.periods) calibration.start calibration.stop lon lat 1 2016-05-07 2016-05-17 -68.21627 48.