Originally Posted by
ExRR
Until recently it wasn't an issue as long as the duplicates were far apart. Two things have led to it becoming an issue. Improvements in aircraft flight data management systems which mean they may cover a wider area and much longer flights which, as in this case, mean an aircraft may fly through both. ICAO have been trying to eliminate the duplicates but States are reluctant to change theirs because it means changing maps and often the waypoint name has some local meaning, AVANT for Havant for example. Reading between the lines, possibly wrongly, it looks as though simple duplication wasn't an issue here, duplication where the duplicated waypoint is in a certain place on the route was.