Haiyang HFF-650, Manual

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Operation
Fishfinder modes are selectable for single frequency or dual and some functions, for example bottom
zoom or lock.
▶ Press [MODE]
1. Normal (200KHz or 50KHz)
Normal mode (with Auto Range active) displays the sounder image with the surface at the top of the
screen and the sea bottom in the lower part of the screen. The depth scale indicates the depth range
appearing in the display. Bottom contours and fish echoes are displayed at the depths where they are
detected. If the depth Range is set manually to a value less than actual water depth, sea bottom
echoes are not displayed, but all other echoes within the Range setting are displayed.
2. Bottom Zoom (200KHz or 50KHz)
Bottom Zoom magnifies the sounder display from the sea bottom toward the surface for a short
distance. The sea bottom contour is displayed and additional contour lines are added at intervals
above the sea bottom to aid in determining distances of echoes near the bottom. Use the Sounder
Menu to set the magnified Bottom Range from 2.5 to 20m (10 to 60ft.). Default setting is 10m (40ft.). If
the depth Range is set manually, the setting must place the sea bottom echo in the lower portion of the
screen for Bottom Zoom to be effective.