northen diver
Contributor
Gary D.:This is an example of so-so vis but it is far from zero vis. That light is a UK800R about 6' away. http://www.scubaboard.com/gallery/showphoto.php/photo/14319/cat/500/ppuser/2714
If you want an example of zero vis. go into a closet at night with no outside light in the area and close your eyes with a black trash bag over your head. Don't seal the bag or you'll die. That's close to zero vis. The bottom of a mine shaft a mile or two from the opening with no lighting at all in the shaft might be another example. So is 30+ feet into oatmeal silt.
If you can see your gages pressed against your mask with a light it isn't zero but really bad vis.
Gary D.
Vis was acutally quite good here. Lots of sun during the day and half moon at night.
Hey Gary D. Arent ya on Military.com also?............