Raymarine Marine GPS System - Manual (Page 134)

Advanced Navigator Functions
5-43
Using the A-Scope
The scrolling bottom display provides a historical record of sonar
echoes. A-Scope displays a real-time image of the bottom structure
and fish directly below the transducer, alongside the scrolling bottom
display. At the lower end of the window, A-Scope also displays the
patented Bottom Coverage width indication.
To display the A-Scope image:
1. From the top-level Functionbar menu, click A-Scope .
2. Click A-Scope Mode . A drop-down menu appears.
3. From the drop-down menu, select one of the three modes
for A-Scope:
Ø Mode 1 – the A-Scope image is angled outward as the
signal width (indicated with dotted lines) increases
with depth.
Ø Mode 2 – the image expands to take up the entire
A-Scope window, providing greater resolution.
Ø Mode 3 – the left-hand side of the image displayed in
Mode 2 expands to the entire A-Scope window.
This mode provides the greatest resolution.
4. Click the A-Scope: ON/OFF to toggle the A-Scope on.
The display is split vertically, with the A-Scope image in
the right hand window and the scrolling bottom image in
the left hand window.
Note: If the Bottom Lock or Zoom image is displayed,
selecting A-Scope automatically switches off Bottom
Lock or Zoom. If you have split frequency selected, the
A-Scope image is displayed in both frequency windows.
To remove the A-Scope image:
1. Click A-Scope .
2. Click A-Scope: ON/OFF to toggle A-Scope off.
3. Click ENTER , CLEAR , or BACK to return to the top-level
Functionbar menu.