Humminbird HELIX 5 G2 SERIES Operation Manual page 81

Show/Hide the Frequency Label
The Frequency Label displays the currently selected frequencies. See Set up Sonar.
1. Main Menu: Press the MENU key twice. Select the Sonar tab.
2. Select Frequency Label.
3. Select On (show) or Off (hide).
Down Imaging View with the Frequency Label Turned On
selected display
frequency
81 Down Imaging Sonar