first time passage

Hi

I have GPS tracking data for a bird and I would like to use the first 
passage time method to identify and estimate the size of the zones of area 
restricted search (ARS) that can be indicative of foraging trips.

Can I do this in R? Is there a package for it? 

I am really new to R, so I will be glad if someone can help me!

Thank you,

Ana

PhD student
Evolutionary Ecology Group
Department of Zoology
University of Cambridge