Viz (Visibility)
Definition
Viz is short for visibility, describing how far a diver can see underwater, typically measured in feet or meters.
More on Viz (Visibility)
Visibility is one of the most important dive conditions. Good viz enhances safety, enjoyment, and photo opportunities, while poor viz may require extra caution and navigation skill. Factors that affect viz include plankton, silt, wave action, rain, upwelling, and diver movement. Some locations consistently offer clear water (e.g., the Red Sea), while others may vary daily. Dive reports and local guides usually provide visibility estimates before dives.
Frequently Asked Questions
Typically 15+ meters (50+ feet) is excellent. 5–15 meters is average, and under 5 meters is low.
Stirred-up silt, plankton blooms, rough seas, or diver finning can all reduce clarity.
It can increase risks like buddy separation and navigation errors. Use lights and stay close.
Stick with your buddy, use a line if needed, carry a light, and monitor your location constantly.
Yes. Some nocturnal or ambush predators thrive in murky waters where they can hunt more easily.