[Vis5d-users] Underwater Topo

Hi to all out there

I am using Vis5d to visualise some oceanography data.
I tried the Maketopo utility.
However the topo map appears at the 0.0 level
how do I get the underwater topo shown and not just see a blue layer at the
top
does it mean that I had to code the data as 0.0 level being the base of my
underwater topo?
Anyone can help???

ps: by the way, enjoy the holidays
     Merry Christmas !!!

GT