Raymarine 465 Instruction Manual page 63

create wider lines. Unlike the scrolling FishFinder Page, the
A-Scope does not show a history of scans; instead, it is a
"real-time" display. The shape of the A-Scope display shows
the result as the sonar beam spreads as it penetrates
deeper into the water.
Bottom coverage
The digital number at the bottom of the A-Scope image
indicates the bottom coverage. This is the diameter of the
sonar beam where it meets the bottom. This is computed
using the beam angle of the transducer for the frequency
you have selected. If the entry for Depth Units in the
System Setup Menu is set to Feet or Fathoms, the bottom
coverage will be reported in feet. If the Depth Units entry
is set to Meters, the bottom coverage will be reported in
meters. The beam angle used for the computation
depends on the frequency selected in the Setup Menu:
Frequency
200 kHz
50 kHz
200 DUAL
50 DUAL
SPLIT
If you want to exit from the A-Scope Mode, press the A-Scope button
again. The unit will return to the FishFinder Page.
52
Bottom Coverage Beam Angle
16°
65°
65°
65°
16° (top);
65° (bottom)
Operating Instructions