Displaying The A-Scope - NorthStar 490 Echosounder Operation Manual

Displaying the A-scope

490 Echo Sounder Operations Manual Rev. B2
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.
Chapter 5 - Other Functions: Using the MORE key
Page 5-3