Humminbird 515 - Manual (Page 45)

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455 kHz Balance
(Advanced; 575 Fishfinders only)
455 kHz Balance adjusts the sensitivity of the 455 kHz beam and is only available
on 575 models. Increasing the sensitivity will display additional weak returns and
decreasing the sensitivity will display fewer weak returns. The 455 kHz Balance
menu choice is only available when User Mode is set to Advanced (see Setup
Menu Tab: User Mode).
NOTE: 455 kHz Balance is particularly useful for adjusting the sensitivity of the 455 kHz sonar
returns in the Side Beam View. The 455 kHz sensitivity can be adjusted without affecting the
sensitivity of the 200 kHz returns shown in the 200 kHz sonar window.
To change the 455 kHz Balance setting:
1. Make sure you have selected Advanced Mode, then highlight 455kHz
Balance on the Sonar Main Menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the 455
kHz Balance. (-10 to +10, Default = 0)