NorthStar Navigation Echo Sounder NorthStar 491 - Manual (Page 47)

491 Echo Sounder Operations Manual Page 43
The A-Scope shows every ping received, even when the
advance speed setting causes pings to be averaged before
display
Displaying the A-scope
The echo sounder’s A-scope lets you look closely at present or
past echoes by horizontally magnifying the echo from each
ping.
To display the A-scope:
1. Press MORE.
2. Press A-SCOPE to turn the A-Scope on or off.
A-scope on single-frequency echo screen
The A-scope appears on the far right-hand side of the
screen, magnifying the water column designated by the
position marker.