Sonar is a type of electronic equipment that uses sound waves to locate objects underwater.

But how does it work? Sonar can be divided into two basic types: active and passive. Active sonar emits an acoustic signal into the water column and then listens for echoes from objects within range; passive sonar just listens for sounds made by other devices nearby—and it’s this type we’ll focus on here!

How much they cost

Sonar devices are used to measure the speed and direction of water, which is important for determining how underwater objects move. They help boaters avoid hitting rocks or other obstructions in the water, so they’re an essential safety tool for any boat owner.

Besides helping keep you safe on the water, sonar devices can also be used for recreational activities like fishing and scuba diving—and if you’re really into marine life (or just love your gadgets), it might be worth investing in one!

There are plenty of different types available depending on what exactly you want to use it for:

• Basic: $100-$150
• Advanced: $300-$400
• Professional: $1000-$1,500 Or less if you get used models

The importance of sonar

Sonar is a very important tool for fishers. It helps them to see what’s under the water, so they can get good catches. Sonars are also used by divers to locate shipwrecks and underwater caves. In Namibia, you can buy sonars at many stores like Makro or Sanlam. A basic model will cost around N$500 and a good one will cost between N$300 and N$1 000 depending on how good it is. You need to make sure your sonar has an HDMI output so you can connect it to your TV or laptop!