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Page 12 491 Echo Sounder Operations Manual
Displaying the echo sounder’s picture
Once the navigator has been configured to operate with the
491, you’re ready to start viewing echo sounding data.
To see the echo sounding screen at any time, press STAR from
any screen. You’ll see live echoes moving across the screen.
Figure 6: Illustrated ECHO screen
You can also review old echoes using Northstar’s SoundTrac™
feature. To activate SoundTrac, press the CURSOR PAD left or
right on the ECHO screen. The position marker appears
(controlled by the CURSOR PAD), and movement of echoes to
the left stops. The data boxes at the bottom of the screen turn
white and refer to the position marker rather than to your
current position. Press the green LIVE DATA key to return to
Depth Scale
Depth
box
Water
temperature
box
Water
temperature
scale
Depth
marker
and
indicator
Echo data
Lat/lon of
vessel
Dist/brg
to waypoint
Steering indicator Speed, course, and speed
through the water
Frequency
selection and
indicator
Navigation
information
Color
bar