Humminbird 515 - Manual (Page 44)

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Zoom Width
Zoom Width adjusts the width of the Zoom
window on the Sonar Zoom View.
To change the Zoom Width Setting:
1. Highlight Zoom Width on the Sonar main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Zoom
Width setting. (Narrow, Medium, Wide, Default = Wide).
83 kHz Sensitivity
(Advanced; 575 Fishfinders only)
83 kHz Sensitivity changes the sensitivity of the 83 kHz beam and is only
available on 575 models. Increasing the 83 kHz Sensitivity will display
additional weak returns and decreasing the 83 kHz Sensitivity will display fewer
weak returns. The 83 kHz Sensitivity menu choice is only available when User
Mode is set to Advanced (see Setup Menu Tab: User Mode).
NOTE: 83 kHz Sensitivity is particularly useful for adjusting the sensitivity of the 83 kHz sonar
returns in the 200/83 kHz Split Sonar View. The 83 kHz sensitivity can be adjusted without
affecting the sensitivity of the 200 kHz returns shown in the 200 kHz sonar window.
To set the 83 kHz Sensitivity:
1. Make sure you are in Advanced User Mode, then highlight 83 kHz
Sensitivity on the Sonar main menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to set the 83 kHz
Sensitivity. (-10 to +10, Default = 0)