Humminbird HELIX Series Operation Manual page 86

Switch Frequencies
If the transducer includes more than one frequency for Down Imaging, use the CHECK/INFO key to quickly change the frequency
used in the Down Imaging View. For more information see Sonar Overview and Set up Sonar.
1. With a Down Imaging View displayed on-screen, press the CHECK/INFO key.
Using the CHECK key to Switch Frequencies (HELIX 9 CHIRP DI GPS G2N)
frequency
label
Switch Frequencies
86
Down Imaging Sonar