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  1. Dear Eldar, Thank you for your answer. Sadly, it didn't solve the problem. However, I tried to change the coordinates in start=c(lon, lat) in the make.prerun.object function. Using the real longitude works fine (long=-79.88566) but I get the same error message when I try the real latitude (lat=72.89986). Any values below 65.6 of latitude works, though. Could there be a constraint in the maximum latitude we can use with this function? I then tried to extend the grid to up to lat=90, but the prerun function still didn't work with latitudes above 65. Grid<-make.grid(left=-83
  2. 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.
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