WX SYSTEMS REFRESHER COURSE COMMENCES, 19.04.2004. The WX Systems Refresher Training Course started today in the idyllic Swiss town of Interlaken, near Berne. The Refresher Course is the ideal training environment for procedure specialists who are familiar with the WX Systems Software, but have not attended training for a number of years. the Course was attended by executives from the Irish Aviation Authority, and Air Safety Support International of the United Kingdom.