NorthStar 972 用户手册

Reference Manual Revision B

A dual-frequency screen is split into two 
halves separated by a vertical line in the 
center.

When using the zoom feature (which also 
splits the screen into halves), both sides of 
the screen always display the same 
frequency.

The echo sounder’s zoom feature expands 
a portion of the echoes. You can examine 
closely any part of the water column to 
determine the composition of the bottom 
or look at the echoes of fish, rocks, or 
wrecks. When fishing, the zoom function is 
useful for showing a detailed view of any 
echoes below the vessel.   

Press the Zoom menu key on the 

 screen to cycle through the four 

zoom modes (or turn the zoom feature off): 

bottom zoom

bottom lock

bottom lock/center

marker zoom 

The current zoom mode is displayed on 
the Zoom key.

For all zoom modes, the original unzoomed 
echoes are on the right side, and the 

magnified area is shown on the left side of 
the screen.

Press 

 to zoom in and increase the 

magnification of the echoes you see below 
the top edge of the marker. Press 

 to 

zoom out and increase the amount of 
water seen. 

Six depth ranges are available for the 
magnified echoes: 15’, 30’, 60’, 120’, 240’ 
and 480’. Similar scales are available for the 
other depth units.