It don’t mean a thing if ain’t got that ping. With apologies to the first lady of song, the late great Ella Fitzgerald, that sums up fish-finder performance. The world’s finest sonar is useless ...

Here’s a number you might not believe: 30. That’s the number of chirp transducers offered by Airmar, the single largest maker of sonar transducers for recreational marine use. While Airmar was once ...