North Atlantic Tracks in FS

[iqbal]

Just wanted to ask how one reads the north atlantic track info,

for example track echo for today (24/3/2009) is this:

E BEDRA 49/20 48/30 48/40 47/50 RONPO COLOR
EAST LVLS NIL
WEST LVLS 310 320 330 340 350 360 370 380 390
EUR RTS WEST NIL
NAR N86B N88A-

OK I know this is track ECHO (E), and the routing is BEDRA 4920N etc etc to COLOR
and that it is for westerly flights from FL310 to 390
but what does EUR RTS WEST mean ?
and what is "NAR" stand for ? (although I know what N86B and N88A are)

if anyone could help it would be greatly appereciated, thanks