Tanga Arrival????
Sorry mate , u asking the wrong people (ATC). All those new arrivals were paid for and designed by Etihad. Maybe they can explain. Ooooops sorry, they wont explain, cos most of them come from Boxak, Nobto and Rovos. The few who come thru there, don't have a clue in any case, cos they put the autopilot in charge, until they get radar vectors.