Visibility — What It Is and Why It Matters
Visibility (vis) is the horizontal distance a diver can see underwater, measured in meters or feet. It is one of the most important factors in dive site selection, dive planning, and overall enjoyment. Visibility ranges from less than 1 meter in silty rivers to 40+ meters in crystal-clear tropical ocean water.
Factors affecting visibility include sediment, plankton, tides, currents, runoff, and thermoclines. Low visibility increases task loading, navigation difficulty, and buddy-separation risk, requiring closer buddy proximity, compass navigation, and higher situational awareness. Dive computers with bright, high-contrast displays are especially valuable in low-visibility conditions.
Frequently Asked Questions
What is considered good visibility for diving?
Visibility above 15 meters (50 feet) is generally considered good. Above 30 meters is excellent. Below 5 meters is low visibility and requires extra caution. Below 1 to 2 meters is very low visibility and is challenging even for experienced divers.
Does visibility change during a dive?
Yes. Visibility can change with depth (clearer below a silty surface layer or murky below a thermocline), with current shifts, and as fin kicks stir up sediment. It can also change with time of day as sunlight angle changes. Always be prepared for conditions to be different from the briefing.
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