Source:- LIDO - Legends and Tables
"The airway type can be either conventional or RNAV. RNAV airways will be labelled either with "R" or the RNP value, if applicable eg:RNP 5."
Its in a small circle beside the airway name
eg: UL131 ⑤
Last edited by MCDU2; 14th November 2012 at 17:22.