http://www.abc.net.au/pm/content/2004/s1137965.htm
but
http://www.law.fsu.edu/library/collection/LimitsinSeas/IBS164.pdf
says the border has been well delineated since 1975
as the shatt al arab thalweg
including 60 plotted points upon it
it also states however that this border changes not just with
accretions but even with avulsions
yikes
never heard of that before
but i should think such a high stepping thalweg must trump its
fixed geodetic points practically as soon as they are established
& recorded
& it was evidently for this reason that saddam & the shah even
agreed at the time to revise the control points every 10 years
tho i doubt they or their successors ever have done so
but i imagine the reporter was just referring to the fact that a high
flowing tide tends to obscure the channel unless it is marked
but even if the border & channel arent marked
as seems to be the case
i still have to wonder how these sailors could have missed such
an obvious border
since they were reportedly captured with maps on them
also how did the british government know they had violated
iranian territory
& immediately admitted they were tresspassing
despite having been completely out of touch with them since
before they went missing
must be a lot more here than meets than eye