There's some discussion of Panama requirements in 'The New New
Thing'.
Not just a lock, but there's a bridge to worry about; passing under
it
at low tide is your height limit.
i would imagine the problem would be at high, not low, tide.
oops. mea culpa.
L.
Sorry to add yet another post to a pointless thread but...
Lloyd was right the first time. Height limit would be based on low tide.
For ships that are near the height limit, waiting a mean time of 6 hours
for the next low tide is not a big deal.
-Mark