Google is your friend.
I did searches under:
Karachi hydrography
Karachi harbor
Karachi shipping statistics
15-minutes and I was done.
As to Ormara, it's only about 100-miles down the coast, I'd be comfortable using the Karachi info. The only significant difference I can see is that, unlike Karachi, Ormara is not at the mouth of a major river system, so I'd expect to find less silt on the bottom (i.e., sandy instead of muddy).