I can only take 2 trips per year and I am going to Nicaragua in March 2013 and Belize in December 2013 so that is it for 2013 unless a quicky weekend thing comes up in the Spring like Washington DC did in May. So in order for certificates not to expire, I book as far ahead of time as I can so I can use the certs befor ethey expire - hence looking for winter 2014 already ;-0