CAUTION - QUALITY OF BATHYMETRIC DATA 
The areas represented by the object M_QUAL (Quality of Data) are approximate due 
to generalizing for clarity. Caution is advised, particularly for near shore navigation 
or voyage planning. M_QUAL represents areas of uniform quality of bathymetric 
data. The CATZOC (Category of Zone of Confidence in Data) attribute of M_QUAL 
provides an assessment of the overall zone of confidence. Channels maintained by 
the U.S. Army Corps of Engineers are periodically resurveyed and the quality of data 
in these channels has not been assessed. 