Look for flocks of birds near the surface of the water

Use soap and water

etc Recommended for short-term operation only

Garmin's Ultra HD scanning sonar shows you incredibly detailed images of fish and structure up to 200 feet below the boat with 800 kHz ClearVü

2-component paint and aluminium

Garmin AIRMAR® B258 Fugemasse Look for flocks of birdsThis 8 pin 1 kW mid level transducer with a narrow beam is good for deep water and bottom definition. It has a depth of 1,500 to 2,200 feet (457 to 671 m), an operating frequency of 50 to 200 kHz, a beam width of 14 x 23 to 3 x 5 degrees, and a bottom elevation of 0 to 26. The transducer kit comes with installation instructions. Follow the instructions carefully to avoid damaging the boat.