Setting The Echo Screen Data - NorthStar Echo Sounder 491 Operation Manual

Using the A-scope
with dual
frequencies
Using the A-scope
with zoom mode

Setting the ECHO screen data

Page 44
If you're displaying both 50 and 200 kHz echoes, the A-scope
magnifies echoes from the frequency shown on the right side
of the screen.
A-scope on dual-frequency echo screen
If you're in zoom mode, the A-scope magnifies the unzoomed
echoes on the right side of the screen.
Screen data refers to numeric and graphic information
displayed on top of the echoes, including bottom depth, water
temperature, and speed through the water (STW).
To access these functions, press MORE, and then DATA.
491 Echo Sounder Operations Manual