Sonar Explained. A school of White Groupers in mid-waters.

A school of White Groupers (Epinephelus aeneus) suspended in mid-water as depicted on my sonar’s screen.
Beneath the smooth ocean surface extends an underwater landscape as complex as nothing you might find on land. Some features, like canyons and seamounts, might look familiar, while others are unique to the deep. The seabed’s morphology gives prey the chance to hide from its predators, while the experienced spearo has the chance to hide his body’s volume and surprise his target.

It is very important for the u/w hunter to know the geomorphology and fish species of his hunting field, so as to choose the appropriate technique for a successful outcome.

Screenshot taken with SIMRAD NSS12 evo 3s. I am using Airmar Technology Corporation transducers.

If you want to understand how the sonar works, click here.

Vassilis is a passionate and knowledgable freediving and spearfishing trainer.