GPS_Rissa.csv

datetime = date and time of class "POSIXct" "POSIXt" - UTC (Universal Time, Coordinated)
Latitude = Latitude WGS84
Longitude = Longitude WGS84
trackID = track ID, corresponding to the whole tracking length (between capture and recapture)
Speed = speed between two locations (m/s)
birdTrip = trip ID (i.e., many trips per track)
nPoints = number of GPS locations per trip
maxDist = maximum distance flew per trip (km)
ring = individual ring number
colony = colony name
stage = breeding stage; "Incubation" or "Chick Rearing"
sex = male or female. NA corresponding to unknown
Nest = nest ID
Year = year of sampling

GF_Use.csv

trackID = track ID, corresponding to the whole tracking length (between capture and recapture)
birdTrip = trip ID (i.e., many trips per track)
maxDist = maximum distance flew in the trip (km)
ring = individual ring number
colony = colony name
stage = breeding stage; "Incubation" or "Chick Rearing"
Nest = nest ID
Year = year of sampling
Prop.All = trip-based. Proportion of the trip that was spent at glacier fronts
Time.All = trip-based.Time duration (min) of glacier fronts use
Bin.All = trip-based. Is the tracked individual used at least one glacier front (1 = Yes; 0 = No)
proportion = glacier-based. Proportion of the trip that was spent at a specific glacier front
binom = glacier-based. Is the tracked individual used the specific glacier front (1 = Yes; 0 = No)
time = glacier-based. Time duration (min) of specific glacier front use
distance = distance (km) separating the individual's colony centroid and the specific glacier front
glacier = glacier names